FlatCAM/FlatCAMApp.py

############################################################
# FlatCAM: 2D Post-processing for Manufacturing            #
# http://flatcam.org                                       #
# Author: Juan Pablo Caram (c)                             #
# Date: 2/5/2014                                           #
# MIT Licence                                              #
############################################################

import sys
import traceback
import urllib.request, urllib.parse, urllib.error
import getopt
import os
import random
import logging
import simplejson as json

import re
import os
from stat import S_IREAD, S_IRGRP, S_IROTH
import subprocess

import tkinter as tk
from PyQt5 import QtCore, QtGui, QtWidgets, QtPrintSupport
import time  # Just used for debugging. Double check before removing.
import urllib.request, urllib.parse, urllib.error
import webbrowser
from contextlib import contextmanager
from xml.dom.minidom import parseString as parse_xml_string
from copy import copy,deepcopy
import numpy as np
from datetime import datetime
import gc

########################################
##      Imports part of FlatCAM       ##
########################################
from ObjectCollection import *
from FlatCAMObj import *
from PlotCanvas import *
from FlatCAMGUI import *
from FlatCAMCommon import LoudDict
from FlatCAMPostProc import load_postprocessors
from FlatCAMEditor import FlatCAMGeoEditor, FlatCAMExcEditor
from FlatCAMProcess import *
from FlatCAMWorkerStack import WorkerStack
from VisPyVisuals import Color
from vispy.gloo.util import _screenshot
from vispy.io import write_png

from flatcamTools import *

from multiprocessing import Pool
import tclCommands

# from ParseFont import *


########################################
##                App                 ##
########################################
class App(QtCore.QObject):
    """
    The main application class. The constructor starts the GUI.
    """

    # Get Cmd Line Options
    cmd_line_shellfile = ''
    cmd_line_help = "FlatCam.py --shellfile=<cmd_line_shellfile>"
    try:
        # Multiprocessing pool will spawn additional processes with 'multiprocessing-fork' flag
        cmd_line_options, args = getopt.getopt(sys.argv[1:], "h:", ["shellfile=", "multiprocessing-fork="])
    except getopt.GetoptError:
        print(cmd_line_help)
        sys.exit(2)
    for opt, arg in cmd_line_options:
        if opt == '-h':
            print(cmd_line_help)
            sys.exit()
        elif opt == '--shellfile':
            cmd_line_shellfile = arg

    # Logging ##
    log = logging.getLogger('base')
    log.setLevel(logging.DEBUG)
    # log.setLevel(logging.WARNING)
    formatter = logging.Formatter('[%(levelname)s][%(threadName)s] %(message)s')
    handler = logging.StreamHandler()
    handler.setFormatter(formatter)
    log.addHandler(handler)

    # Version
    version = 8.905
    version_date = "2019/01/29"
    beta = True

    # URL for update checks and statistics
    version_url = "http://flatcam.org/version"

    # App URL
    app_url = "http://flatcam.org"

    # Manual URL
    manual_url = "http://flatcam.org/manual/index.html"
    video_url = "https://www.youtube.com/playlist?list=PLVvP2SYRpx-AQgNlfoxw93tXUXon7G94_"

    should_we_quit = True

    ##################
    ##    Signals   ##
    ##################

    # Inform the user
    # Handled by:
    #  * App.info() --> Print on the status bar
    inform = QtCore.pyqtSignal(str)

    # General purpose background task
    worker_task = QtCore.pyqtSignal(dict)

    # File opened
    # Handled by:
    #  * register_folder()
    #  * register_recent()
    # Note: Setting the parameters to unicode does not seem
    #       to have an effect. Then are received as Qstring
    #       anyway.

    # File type and filename
    file_opened = QtCore.pyqtSignal(str, str)
    # File type and filename
    file_saved = QtCore.pyqtSignal(str, str)

    # Percentage of progress
    progress = QtCore.pyqtSignal(int)

    plots_updated = QtCore.pyqtSignal()

    # Emitted by new_object() and passes the new object as argument, plot flag.
    # on_object_created() adds the object to the collection, plots on appropriate flag
    # and emits new_object_available.
    object_created = QtCore.pyqtSignal(object, bool, bool)

    # Emitted when a object has been changed (like scaled, mirrored)
    object_changed = QtCore.pyqtSignal(object)

    # Emitted after object has been plotted.
    # Calls 'on_zoom_fit' method to fit object in scene view in main thread to prevent drawing glitches.
    object_plotted = QtCore.pyqtSignal(object)

    # Emitted when a new object has been added to the collection
    # and is ready to be used.
    new_object_available = QtCore.pyqtSignal(object)
    message = QtCore.pyqtSignal(str, str, str)

    # Emmited when shell command is finished(one command only)
    shell_command_finished = QtCore.pyqtSignal(object)

    # Emitted when multiprocess pool has been recreated
    pool_recreated = QtCore.pyqtSignal(object)

    # Emitted when an unhandled exception happens
    # in the worker task.
    thread_exception = QtCore.pyqtSignal(object)

    def __init__(self, user_defaults=True, post_gui=None):
        """
        Starts the application.

        :return: app
        :rtype: App
        """

        App.log.info("FlatCAM Starting...")

        ###################
        ### OS-specific ###
        ###################

        # Folder for user settings.
        if sys.platform == 'win32':
            from win32com.shell import shell, shellcon
            if platform.architecture()[0] == '32bit':
                App.log.debug("Win32!")
            else:
                App.log.debug("Win64!")
            self.data_path = shell.SHGetFolderPath(0, shellcon.CSIDL_APPDATA, None, 0) + \
                '\FlatCAM'
            self.os = 'windows'
        else:  # Linux/Unix/MacOS
            self.data_path = os.path.expanduser('~') + \
                '/.FlatCAM'
            self.os = 'unix'

        ###############################
        ### Setup folders and files ###
        ###############################

        if not os.path.exists(self.data_path):
            os.makedirs(self.data_path)
            App.log.debug('Created data folder: ' + self.data_path)
            os.makedirs(os.path.join(self.data_path, 'postprocessors'))
            App.log.debug('Created data postprocessors folder: ' + os.path.join(self.data_path, 'postprocessors'))

        self.postprocessorpaths = os.path.join(self.data_path,'postprocessors')
        if not os.path.exists(self.postprocessorpaths):
            os.makedirs(self.postprocessorpaths)
            App.log.debug('Created postprocessors folder: ' + self.postprocessorpaths)

        # create current_defaults.FlatConfig file if there is none
        try:
            f = open(self.data_path + '/current_defaults.FlatConfig')
            f.close()
        except IOError:
            App.log.debug('Creating empty current_defaults.FlatConfig')
            f = open(self.data_path + '/current_defaults.FlatConfig', 'w')
            json.dump({}, f)
            f.close()

        # create factory_defaults.FlatConfig file if there is none
        try:
            f = open(self.data_path + '/factory_defaults.FlatConfig')
            f.close()
        except IOError:
            App.log.debug('Creating empty factory_defaults.FlatConfig')
            f = open(self.data_path + '/factory_defaults.FlatConfig', 'w')
            json.dump({}, f)
            f.close()

        try:
            f = open(self.data_path + '/recent.json')
            f.close()
        except IOError:
            App.log.debug('Creating empty recent.json')
            f = open(self.data_path + '/recent.json', 'w')
            json.dump([], f)
            f.close()

        # Application directory. CHDIR to it. Otherwise, trying to load
        # GUI icons will fail as their path is relative.
        # This will fail under cx_freeze ...
        self.app_home = os.path.dirname(os.path.realpath(__file__))
        App.log.debug("Application path is " + self.app_home)
        App.log.debug("Started in " + os.getcwd())

        # cx_freeze workaround
        if os.path.isfile(self.app_home):
            self.app_home = os.path.dirname(self.app_home)

        os.chdir(self.app_home)

        # Create multiprocessing pool
        self.pool = Pool()


        ####################
        ## Initialize GUI ##
        ####################

        # FlatCAM colors used in plotting
        self.FC_light_green = '#BBF268BF'
        self.FC_dark_green = '#006E20BF'
        self.FC_light_blue = '#a5a5ffbf'
        self.FC_dark_blue = '#0000ffbf'

        QtCore.QObject.__init__(self)

        self.ui = FlatCAMGUI(self.version, self.beta, self)
        # self.connect(self.ui,
        #              QtCore.SIGNAL("geomUpdate(int, int, int, int, int)"),
        #              self.save_geometry) PyQt4
        self.ui.geom_update[int, int, int, int, int].connect(self.save_geometry)
        self.ui.final_save.connect(self.final_save)

        ##############
        #### Data ####
        ##############
        self.recent = []
        self.clipboard = QtWidgets.QApplication.clipboard()
        self.proc_container = FCVisibleProcessContainer(self.ui.activity_view)

        self.project_filename = None
        self.toggle_units_ignore = False

        # self.defaults_form = PreferencesUI()
        self.general_defaults_form = GeneralPreferencesUI()
        self.gerber_defaults_form = GerberPreferencesUI()
        self.excellon_defaults_form = ExcellonPreferencesUI()
        self.geometry_defaults_form = GeometryPreferencesUI()
        self.cncjob_defaults_form = CNCJobPreferencesUI()
        self.tools_defaults_form = ToolsPreferencesUI()

        # when adding entries here read the comments in the  method found bellow named:
        # def new_object(self, kind, name, initialize, active=True, fit=True, plot=True)
        self.defaults_form_fields = {
            "units": self.general_defaults_form.general_app_group.units_radio,
            "global_shell_at_startup": self.general_defaults_form.general_app_group.shell_startup_cb,
            "global_version_check": self.general_defaults_form.general_app_group.version_check_cb,
            "global_send_stats": self.general_defaults_form.general_app_group.send_stats_cb,
            "global_gridx": self.general_defaults_form.general_gui_group.gridx_entry,
            "global_gridy": self.general_defaults_form.general_gui_group.gridy_entry,
            "global_plot_fill": self.general_defaults_form.general_gui_group.pf_color_entry,
            "global_plot_line": self.general_defaults_form.general_gui_group.pl_color_entry,
            "global_sel_fill": self.general_defaults_form.general_gui_group.sf_color_entry,
            "global_sel_line": self.general_defaults_form.general_gui_group.sl_color_entry,
            "global_alt_sel_fill": self.general_defaults_form.general_gui_group.alt_sf_color_entry,
            "global_alt_sel_line": self.general_defaults_form.general_gui_group.alt_sl_color_entry,
            "global_draw_color": self.general_defaults_form.general_gui_group.draw_color_entry,
            "global_sel_draw_color": self.general_defaults_form.general_gui_group.sel_draw_color_entry,
            "global_pan_button": self.general_defaults_form.general_app_group.pan_button_radio,
            "global_mselect_key": self.general_defaults_form.general_app_group.mselect_radio,
            # "global_pan_with_space_key": self.general_defaults_form.general_gui_group.pan_with_space_cb,
            "global_workspace": self.general_defaults_form.general_gui_group.workspace_cb,
            "global_workspaceT": self.general_defaults_form.general_gui_group.wk_cb,

            "gerber_plot": self.gerber_defaults_form.gerber_group.plot_cb,
            "gerber_solid": self.gerber_defaults_form.gerber_group.solid_cb,
            "gerber_multicolored": self.gerber_defaults_form.gerber_group.multicolored_cb,
            "gerber_isotooldia": self.gerber_defaults_form.gerber_group.iso_tool_dia_entry,
            "gerber_isopasses": self.gerber_defaults_form.gerber_group.iso_width_entry,
            "gerber_isooverlap": self.gerber_defaults_form.gerber_group.iso_overlap_entry,

            "gerber_combine_passes": self.gerber_defaults_form.gerber_group.combine_passes_cb,
            "gerber_milling_type": self.gerber_defaults_form.gerber_group.milling_type_radio,
            "gerber_noncoppermargin": self.gerber_defaults_form.gerber_group.noncopper_margin_entry,
            "gerber_noncopperrounded": self.gerber_defaults_form.gerber_group.noncopper_rounded_cb,
            "gerber_bboxmargin": self.gerber_defaults_form.gerber_group.bbmargin_entry,
            "gerber_bboxrounded": self.gerber_defaults_form.gerber_group.bbrounded_cb,
            "gerber_circle_steps": self.gerber_defaults_form.gerber_group.circle_steps_entry,

            "excellon_plot": self.excellon_defaults_form.excellon_gen_group.plot_cb,
            "excellon_solid": self.excellon_defaults_form.excellon_gen_group.solid_cb,
            "excellon_format_upper_in": self.excellon_defaults_form.excellon_gen_group.excellon_format_upper_in_entry,
            "excellon_format_lower_in": self.excellon_defaults_form.excellon_gen_group.excellon_format_lower_in_entry,
            "excellon_format_upper_mm": self.excellon_defaults_form.excellon_gen_group.excellon_format_upper_mm_entry,
            "excellon_format_lower_mm": self.excellon_defaults_form.excellon_gen_group.excellon_format_lower_mm_entry,
            "excellon_zeros": self.excellon_defaults_form.excellon_gen_group.excellon_zeros_radio,
            "excellon_units": self.excellon_defaults_form.excellon_gen_group.excellon_units_radio,
            "excellon_optimization_type": self.excellon_defaults_form.excellon_gen_group.excellon_optimization_radio,

            "excellon_drillz": self.excellon_defaults_form.excellon_opt_group.cutz_entry,
            "excellon_travelz": self.excellon_defaults_form.excellon_opt_group.travelz_entry,
            "excellon_feedrate": self.excellon_defaults_form.excellon_opt_group.feedrate_entry,
            "excellon_feedrate_rapid": self.excellon_defaults_form.excellon_opt_group.feedrate_rapid_entry,
            "excellon_spindlespeed": self.excellon_defaults_form.excellon_opt_group.spindlespeed_entry,
            "excellon_dwell": self.excellon_defaults_form.excellon_opt_group.dwell_cb,
            "excellon_dwelltime": self.excellon_defaults_form.excellon_opt_group.dwelltime_entry,
            "excellon_toolchange": self.excellon_defaults_form.excellon_opt_group.toolchange_cb,
            "excellon_toolchangez": self.excellon_defaults_form.excellon_opt_group.toolchangez_entry,
            "excellon_toolchangexy": self.excellon_defaults_form.excellon_opt_group.toolchangexy_entry,
            "excellon_ppname_e": self.excellon_defaults_form.excellon_opt_group.pp_excellon_name_cb,
            "excellon_startz": self.excellon_defaults_form.excellon_opt_group.estartz_entry,
            "excellon_endz": self.excellon_defaults_form.excellon_opt_group.eendz_entry,
            "excellon_tooldia": self.excellon_defaults_form.excellon_opt_group.tooldia_entry,
            "excellon_slot_tooldia": self.excellon_defaults_form.excellon_opt_group.slot_tooldia_entry,
            "excellon_gcode_type": self.excellon_defaults_form.excellon_opt_group.excellon_gcode_type_radio,

            "geometry_plot": self.geometry_defaults_form.geometry_group.plot_cb,
            "geometry_segx": self.geometry_defaults_form.geometry_group.segx_entry,
            "geometry_segy": self.geometry_defaults_form.geometry_group.segy_entry,
            "geometry_cutz": self.geometry_defaults_form.geometry_group.cutz_entry,
            "geometry_travelz": self.geometry_defaults_form.geometry_group.travelz_entry,
            "geometry_feedrate": self.geometry_defaults_form.geometry_group.cncfeedrate_entry,
            "geometry_feedrate_z": self.geometry_defaults_form.geometry_group.cncplunge_entry,
            "geometry_feedrate_rapid": self.geometry_defaults_form.geometry_group.cncfeedrate_rapid_entry,
            "geometry_cnctooldia": self.geometry_defaults_form.geometry_group.cnctooldia_entry,
            "geometry_spindlespeed": self.geometry_defaults_form.geometry_group.cncspindlespeed_entry,
            "geometry_dwell": self.geometry_defaults_form.geometry_group.dwell_cb,
            "geometry_dwelltime": self.geometry_defaults_form.geometry_group.dwelltime_entry,
            "geometry_ppname_g": self.geometry_defaults_form.geometry_group.pp_geometry_name_cb,
            "geometry_toolchange": self.geometry_defaults_form.geometry_group.toolchange_cb,
            "geometry_toolchangez": self.geometry_defaults_form.geometry_group.toolchangez_entry,
            "geometry_toolchangexy": self.geometry_defaults_form.geometry_group.toolchangexy_entry,
            "geometry_startz": self.geometry_defaults_form.geometry_group.gstartz_entry,
            "geometry_endz": self.geometry_defaults_form.geometry_group.gendz_entry,
            "geometry_multidepth": self.geometry_defaults_form.geometry_group.multidepth_cb,
            "geometry_depthperpass": self.geometry_defaults_form.geometry_group.depthperpass_entry,
            "geometry_extracut": self.geometry_defaults_form.geometry_group.extracut_cb,
            "geometry_circle_steps": self.geometry_defaults_form.geometry_group.circle_steps_entry,

            "cncjob_plot": self.cncjob_defaults_form.cncjob_group.plot_cb,
            "cncjob_tooldia": self.cncjob_defaults_form.cncjob_group.tooldia_entry,
            "cncjob_coords_decimals": self.cncjob_defaults_form.cncjob_group.coords_dec_entry,
            "cncjob_fr_decimals": self.cncjob_defaults_form.cncjob_group.fr_dec_entry,
            "cncjob_prepend": self.cncjob_defaults_form.cncjob_group.prepend_text,
            "cncjob_append": self.cncjob_defaults_form.cncjob_group.append_text,
            "cncjob_steps_per_circle": self.cncjob_defaults_form.cncjob_group.steps_per_circle_entry,

            "tools_ncctools": self.tools_defaults_form.tools_ncc_group.ncc_tool_dia_entry,
            "tools_nccoverlap": self.tools_defaults_form.tools_ncc_group.ncc_overlap_entry,
            "tools_nccmargin": self.tools_defaults_form.tools_ncc_group.ncc_margin_entry,
            "tools_nccmethod": self.tools_defaults_form.tools_ncc_group.ncc_method_radio,
            "tools_nccconnect": self.tools_defaults_form.tools_ncc_group.ncc_connect_cb,
            "tools_ncccontour": self.tools_defaults_form.tools_ncc_group.ncc_contour_cb,
            "tools_nccrest": self.tools_defaults_form.tools_ncc_group.ncc_rest_cb,

            "tools_cutouttooldia": self.tools_defaults_form.tools_cutout_group.cutout_tooldia_entry,
            "tools_cutoutmargin": self.tools_defaults_form.tools_cutout_group.cutout_margin_entry,
            "tools_cutoutgapsize": self.tools_defaults_form.tools_cutout_group.cutout_gap_entry,
            "tools_gaps_rect": self.tools_defaults_form.tools_cutout_group.gaps_radio,

            "tools_painttooldia": self.tools_defaults_form.tools_paint_group.painttooldia_entry,
            "tools_paintoverlap": self.tools_defaults_form.tools_paint_group.paintoverlap_entry,
            "tools_paintmargin": self.tools_defaults_form.tools_paint_group.paintmargin_entry,
            "tools_paintmethod": self.tools_defaults_form.tools_paint_group.paintmethod_combo,
            "tools_selectmethod": self.tools_defaults_form.tools_paint_group.selectmethod_combo,
            "tools_pathconnect": self.tools_defaults_form.tools_paint_group.pathconnect_cb,
            "tools_paintcontour": self.tools_defaults_form.tools_paint_group.contour_cb
        }
        # loads postprocessors
        self.postprocessors = load_postprocessors(self)

        for name in list(self.postprocessors.keys()):
            self.geometry_defaults_form.geometry_group.pp_geometry_name_cb.addItem(name)
            # HPGL postprocessor is only for Geometry objects therefore it should not be in the Excellon Preferences
            if name == 'hpgl':
                continue
            self.excellon_defaults_form.excellon_opt_group.pp_excellon_name_cb.addItem(name)

        self.defaults = LoudDict()
        self.defaults.set_change_callback(self.on_defaults_dict_change)  # When the dictionary changes.
        self.defaults.update({
            "global_serial": 0,
            "global_stats": {},
            "units": "IN",
            "global_version_check": True,
            "global_send_stats": True,
            "global_gridx": 1.0,
            "global_gridy": 1.0,
            "global_plot_fill": '#BBF268BF',
            "global_plot_line": '#006E20BF',
            "global_sel_fill": '#a5a5ffbf',
            "global_sel_line": '#0000ffbf',
            "global_alt_sel_fill": '#BBF268BF',
            "global_alt_sel_line": '#006E20BF',
            "global_draw_color": '#FF0000',
            "global_sel_draw_color": '#0000FF',
            "global_pan_button": '2',
            "global_mselect_key": 'Control',
            # "global_pan_with_space_key": False,
            "global_workspace": False,
            "global_workspaceT": "A4P",
            "global_toolbar_view": 31,

            "global_background_timeout": 300000,  # Default value is 5 minutes
            "global_verbose_error_level": 0,  # Shell verbosity 0 = default
            # (python trace only for unknown errors),
            # 1 = show trace(show trace allways),
            # 2 = (For the future).

            # Persistence
            "global_last_folder": None,
            "global_last_save_folder": None,

            # Default window geometry
            "global_def_win_x": 100,
            "global_def_win_y": 100,
            "global_def_win_w": 1024,
            "global_def_win_h": 650,

            # Constants...
            "global_defaults_save_period_ms": 20000,  # Time between default saves.
            "global_shell_shape": [500, 300],  # Shape of the shell in pixels.
            "global_shell_at_startup": False,  # Show the shell at startup.
            "global_recent_limit": 10,  # Max. items in recent list.
            "fit_key": '1',
            "zoom_out_key": '2',
            "zoom_in_key": '3',
            "grid_toggle_key": 'G',
            "zoom_ratio": 1.5,
            "global_point_clipboard_format": "(%.4f, %.4f)",
            "global_zdownrate": None,

            "gerber_plot": True,
            "gerber_solid": True,
            "gerber_multicolored": False,
            "gerber_isotooldia": 0.016,
            "gerber_isopasses": 1,
            "gerber_isooverlap": 0.15,

            "gerber_combine_passes": False,
            "gerber_milling_type": "cl",
            "gerber_noncoppermargin": 0.1,
            "gerber_noncopperrounded": False,
            "gerber_bboxmargin": 0.1,
            "gerber_bboxrounded": False,
            "gerber_circle_steps": 64,
            "gerber_use_buffer_for_union": True,

            "excellon_plot": True,
            "excellon_solid": True,
            "excellon_format_upper_in": 2,
            "excellon_format_lower_in": 4,
            "excellon_format_upper_mm": 3,
            "excellon_format_lower_mm": 3,
            "excellon_zeros": "L",
            "excellon_units": "INCH",
            "excellon_optimization_type": 'B',
            "excellon_search_time": 3,

            "excellon_drillz": -0.1,
            "excellon_travelz": 0.1,
            "excellon_feedrate": 3.0,
            "excellon_feedrate_rapid": 3.0,
            "excellon_spindlespeed": None,
            "excellon_dwell": False,
            "excellon_dwelltime": 1,
            "excellon_toolchange": False,
            "excellon_toolchangez": 1.0,
            "excellon_toolchangexy": "0.0, 0.0",
            "excellon_tooldia": 0.016,
            "excellon_slot_tooldia": 0.016,
            "excellon_startz": None,
            "excellon_endz": 2.0,
            "excellon_ppname_e": 'default',
            "excellon_gcode_type": "drills",

            "geometry_plot": True,
            "geometry_segx": 0.0,
            "geometry_segy": 0.0,
            "geometry_cutz": -0.002,
            "geometry_travelz": 0.1,
            "geometry_toolchange": False,
            "geometry_toolchangez": 1.0,
            "geometry_toolchangexy": "0.0, 0.0",
            "geometry_startz": None,
            "geometry_endz": 2.0,
            "geometry_feedrate": 3.0,
            "geometry_feedrate_z": 3.0,
            "geometry_feedrate_rapid": 3.0,
            "geometry_cnctooldia": 0.016,
            "geometry_spindlespeed": None,
            "geometry_dwell": False,
            "geometry_dwelltime": 1,
            "geometry_ppname_g": 'default',
            "geometry_depthperpass": 0.002,
            "geometry_multidepth": False,
            "geometry_extracut": False,
            "geometry_circle_steps": 64,

            "cncjob_plot": True,
            "cncjob_tooldia": 0.0393701,
            "cncjob_coords_decimals": 4,
            "cncjob_fr_decimals": 2,
            "cncjob_prepend": "",
            "cncjob_append": "",
            "cncjob_steps_per_circle": 64,

            "tools_ncctools": "1.0, 0.5",
            "tools_nccoverlap": 0.4,
            "tools_nccmargin": 0.1,
            "tools_nccmethod": "seed",
            "tools_nccconnect": True,
            "tools_ncccontour": True,
            "tools_nccrest": False,

            "tools_cutouttooldia": 0.1,
            "tools_cutoutmargin": 0.1,
            "tools_cutoutgapsize": 0.15,
            "tools_gaps_rect": "4",

            "tools_painttooldia": 0.07,
            "tools_paintoverlap": 0.15,
            "tools_paintmargin": 0.0,
            "tools_paintmethod": "seed",
            "tools_selectmethod": "single",
            "tools_pathconnect": True,
            "tools_paintcontour": True

        })

        ###############################
        ### Load defaults from file ###
        if user_defaults:
            self.load_defaults(filename='current_defaults')

        chars = 'abcdefghijklmnopqrstuvwxyz0123456789'
        if self.defaults['global_serial'] == 0 or len(str(self.defaults['global_serial'])) < 10:
            self.defaults['global_serial'] = ''.join([random.choice(chars) for i in range(20)])
            self.save_defaults(silent=True)

        self.propagate_defaults(silent=True)
        self.restore_main_win_geom()

        def auto_save_defaults():
            try:
                self.save_defaults(silent=True)
                self.propagate_defaults(silent=True)
            finally:
                QtCore.QTimer.singleShot(self.defaults["global_defaults_save_period_ms"], auto_save_defaults)

        # the following lines activates automatic defaults save
        # if user_defaults:
        #     QtCore.QTimer.singleShot(self.defaults["global_defaults_save_period_ms"], auto_save_defaults)

        # self.options_form = PreferencesUI()
        self.general_options_form = GeneralPreferencesUI()
        self.gerber_options_form = GerberPreferencesUI()
        self.excellon_options_form = ExcellonPreferencesUI()
        self.geometry_options_form = GeometryPreferencesUI()
        self.cncjob_options_form = CNCJobPreferencesUI()
        self.tools_options_form = ToolsPreferencesUI()

        self.options_form_fields = {
            "units": self.general_options_form.general_app_group.units_radio,
            "global_gridx": self.general_options_form.general_gui_group.gridx_entry,
            "global_gridy": self.general_options_form.general_gui_group.gridy_entry,
            "gerber_plot": self.gerber_options_form.gerber_group.plot_cb,
            "gerber_solid": self.gerber_options_form.gerber_group.solid_cb,
            "gerber_multicolored": self.gerber_options_form.gerber_group.multicolored_cb,
            "gerber_isotooldia": self.gerber_options_form.gerber_group.iso_tool_dia_entry,
            "gerber_isopasses": self.gerber_options_form.gerber_group.iso_width_entry,
            "gerber_isooverlap": self.gerber_options_form.gerber_group.iso_overlap_entry,
            "gerber_combine_passes": self.gerber_options_form.gerber_group.combine_passes_cb,
            "gerber_noncoppermargin": self.gerber_options_form.gerber_group.noncopper_margin_entry,
            "gerber_noncopperrounded": self.gerber_options_form.gerber_group.noncopper_rounded_cb,
            "gerber_bboxmargin": self.gerber_options_form.gerber_group.bbmargin_entry,
            "gerber_bboxrounded": self.gerber_options_form.gerber_group.bbrounded_cb,

            "excellon_plot": self.excellon_options_form.excellon_gen_group.plot_cb,
            "excellon_solid": self.excellon_options_form.excellon_gen_group.solid_cb,
            "excellon_format_upper_in": self.excellon_options_form.excellon_gen_group.excellon_format_upper_in_entry,
            "excellon_format_lower_in": self.excellon_options_form.excellon_gen_group.excellon_format_lower_in_entry,
            "excellon_format_upper_mm": self.excellon_options_form.excellon_gen_group.excellon_format_upper_mm_entry,
            "excellon_format_lower_mm": self.excellon_options_form.excellon_gen_group.excellon_format_lower_mm_entry,
            "excellon_zeros": self.excellon_options_form.excellon_gen_group.excellon_zeros_radio,
            "excellon_units": self.excellon_options_form.excellon_gen_group.excellon_units_radio,
            "excellon_optimization_type": self.excellon_options_form.excellon_gen_group.excellon_optimization_radio,

            "excellon_drillz": self.excellon_options_form.excellon_opt_group.cutz_entry,
            "excellon_travelz": self.excellon_options_form.excellon_opt_group.travelz_entry,
            "excellon_feedrate": self.excellon_options_form.excellon_opt_group.feedrate_entry,
            "excellon_feedrate_rapid": self.excellon_options_form.excellon_opt_group.feedrate_rapid_entry,
            "excellon_spindlespeed": self.excellon_options_form.excellon_opt_group.spindlespeed_entry,
            "excellon_dwell": self.excellon_options_form.excellon_opt_group.dwell_cb,
            "excellon_dwelltime": self.excellon_options_form.excellon_opt_group.dwelltime_entry,
            "excellon_toolchange": self.excellon_options_form.excellon_opt_group.toolchange_cb,
            "excellon_toolchangez": self.excellon_options_form.excellon_opt_group.toolchangez_entry,
            "excellon_toolchangexy": self.excellon_options_form.excellon_opt_group.toolchangexy_entry,
            "excellon_tooldia": self.excellon_options_form.excellon_opt_group.tooldia_entry,
            "excellon_ppname_e": self.excellon_options_form.excellon_opt_group.pp_excellon_name_cb,
            "excellon_startz": self.excellon_options_form.excellon_opt_group.estartz_entry,
            "excellon_endz": self.excellon_options_form.excellon_opt_group.eendz_entry,

            "geometry_plot": self.geometry_options_form.geometry_group.plot_cb,
            "geometry_segx": self.geometry_options_form.geometry_group.segx_entry,
            "geometry_segy": self.geometry_options_form.geometry_group.segy_entry,
            "geometry_cutz": self.geometry_options_form.geometry_group.cutz_entry,
            "geometry_travelz": self.geometry_options_form.geometry_group.travelz_entry,
            "geometry_feedrate": self.geometry_options_form.geometry_group.cncfeedrate_entry,
            "geometry_feedrate_z": self.geometry_options_form.geometry_group.cncplunge_entry,
            "geometry_feedrate_rapid": self.geometry_options_form.geometry_group.cncfeedrate_rapid_entry,
            "geometry_spindlespeed": self.geometry_options_form.geometry_group.cncspindlespeed_entry,
            "geometry_dwell": self.geometry_options_form.geometry_group.dwell_cb,
            "geometry_dwelltime": self.geometry_options_form.geometry_group.dwelltime_entry,
            "geometry_cnctooldia": self.geometry_options_form.geometry_group.cnctooldia_entry,
            "geometry_ppname_g": self.geometry_options_form.geometry_group.pp_geometry_name_cb,
            "geometry_toolchange": self.geometry_options_form.geometry_group.toolchange_cb,
            "geometry_toolchangez": self.geometry_options_form.geometry_group.toolchangez_entry,
            "geometry_toolchangexy": self.geometry_options_form.geometry_group.toolchangexy_entry,
            "geometry_startz": self.geometry_options_form.geometry_group.gstartz_entry,
            "geometry_endz": self.geometry_options_form.geometry_group.gendz_entry,
            "geometry_depthperpass": self.geometry_options_form.geometry_group.depthperpass_entry,
            "geometry_multidepth": self.geometry_options_form.geometry_group.multidepth_cb,
            "geometry_extracut": self.geometry_options_form.geometry_group.extracut_cb,

            "cncjob_plot": self.cncjob_options_form.cncjob_group.plot_cb,
            "cncjob_tooldia": self.cncjob_options_form.cncjob_group.tooldia_entry,
            "cncjob_prepend": self.cncjob_options_form.cncjob_group.prepend_text,
            "cncjob_append": self.cncjob_options_form.cncjob_group.append_text,

            "tools_ncctools": self.tools_options_form.tools_ncc_group.ncc_tool_dia_entry,
            "tools_nccoverlap": self.tools_options_form.tools_ncc_group.ncc_overlap_entry,
            "tools_nccmargin": self.tools_options_form.tools_ncc_group.ncc_margin_entry,

            "tools_cutouttooldia": self.tools_options_form.tools_cutout_group.cutout_tooldia_entry,
            "tools_cutoutmargin": self.tools_options_form.tools_cutout_group.cutout_margin_entry,
            "tools_cutoutgapsize": self.tools_options_form.tools_cutout_group.cutout_gap_entry,
            "tools_gaps": self.tools_options_form.tools_cutout_group.gaps_radio,

            "tools_painttooldia": self.tools_options_form.tools_paint_group.painttooldia_entry,
            "tools_paintoverlap": self.tools_options_form.tools_paint_group.paintoverlap_entry,
            "tools_paintmargin": self.tools_options_form.tools_paint_group.paintmargin_entry,
            "tools_paintmethod": self.tools_options_form.tools_paint_group.paintmethod_combo,
            "tools_selectmethod": self.tools_options_form.tools_paint_group.selectmethod_combo,
            "tools_pathconnect": self.tools_options_form.tools_paint_group.pathconnect_cb,
            "tools_paintcontour": self.tools_options_form.tools_paint_group.contour_cb
        }

        for name in list(self.postprocessors.keys()):
            self.geometry_options_form.geometry_group.pp_geometry_name_cb.addItem(name)
            self.excellon_options_form.excellon_opt_group.pp_excellon_name_cb.addItem(name)

        self.options = LoudDict()
        self.options.set_change_callback(self.on_options_dict_change)
        self.options.update({
            "units": "IN",
            "global_gridx": 1.0,
            "global_gridy": 1.0,
            "global_background_timeout": 300000,  # Default value is 5 minutes
            "global_verbose_error_level": 0,  # Shell verbosity:
            # 0 = default(python trace only for unknown errors),
            # 1 = show trace(show trace allways), 2 = (For the future).

            "gerber_plot": True,
            "gerber_solid": True,
            "gerber_multicolored": False,
            "gerber_isotooldia": 0.016,
            "gerber_isopasses": 1,
            "gerber_isooverlap": 0.15,
            "gerber_combine_passes": True,
            "gerber_noncoppermargin": 0.0,
            "gerber_noncopperrounded": False,
            "gerber_bboxmargin": 0.0,
            "gerber_bboxrounded": False,

            "excellon_plot": True,
            "excellon_solid": False,
            "excellon_format_upper_in": 2,
            "excellon_format_lower_in": 4,
            "excellon_format_upper_mm": 3,
            "excellon_format_lower_mm": 3,
            "excellon_units": 'INCH',
            "excellon_optimization_type": 'B',
            "excellon_search_time": 3,
            "excellon_zeros": "L",

            "excellon_drillz": -0.1,
            "excellon_travelz": 0.1,
            "excellon_feedrate": 3.0,
            "excellon_feedrate_rapid": 3.0,
            "excellon_spindlespeed": None,
            "excellon_dwell": True,
            "excellon_dwelltime": 1000,
            "excellon_toolchange": False,
            "excellon_toolchangez": 1.0,
            "excellon_toolchangexy": "0.0, 0.0",
            "excellon_tooldia": 0.016,
            "excellon_ppname_e": 'default',
            "excellon_startz": None,
            "excellon_endz": 2.0,

            "geometry_plot": True,
            "geometry_segx": 0.0,
            "geometry_segy": 0.0,
            "geometry_cutz": -0.002,
            "geometry_travelz": 0.1,
            "geometry_feedrate": 3.0,
            "geometry_feedrate_z": 3.0,
            "geometry_feedrate_rapid": 3.0,
            "geometry_spindlespeed": None,
            "geometry_dwell": True,
            "geometry_dwelltime": 1000,
            "geometry_cnctooldia": 0.016,
            "geometry_toolchange": False,
            "geometry_toolchangez": 2.0,
            "geometry_toolchangexy": "0.0, 0.0",
            "geometry_startz": None,
            "geometry_endz": 2.0,
            "geometry_ppname_g": "default",
            "geometry_depthperpass": 0.002,
            "geometry_multidepth": False,
            "geometry_extracut": False,

            "cncjob_plot": True,
            "cncjob_tooldia": 0.016,
            "cncjob_prepend": "",
            "cncjob_append": "",

            "tools_ncctools": "1.0, 0.5",
            "tools_nccoverlap": 0.4,
            "tools_nccmargin": 1,
            "tools_cutouttooldia": 0.07,
            "tools_cutoutmargin": 0.1,
            "tools_cutoutgapsize": 0.15,
            "tools_gaps": "4",

            "tools_painttooldia": 0.07,
            "tools_paintoverlap": 0.15,
            "tools_paintmargin": 0.0,
            "tools_paintmethod": "seed",
            "tools_selectmethod": "single",
            "tools_pathconnect": True,
            "tools_paintcontour": True

        })

        self.options.update(self.defaults)  # Copy app defaults to project options

        self.gen_form = None
        self.ger_form = None
        self.exc_form = None
        self.geo_form = None
        self.cnc_form = None
        self.tools_form = None
        self.on_options_combo_change(0)  # Will show the initial form

        ### Define OBJECT COLLECTION ###
        self.collection = ObjectCollection(self)
        self.ui.project_tab_layout.addWidget(self.collection.view)
        ###

        self.log.debug("Finished creating Object Collection.")

        ### Initialize the color box's color in Preferences -> Global -> Color
        # Init Plot Colors
        self.general_defaults_form.general_gui_group.pf_color_entry.set_value(self.defaults['global_plot_fill'])
        self.general_defaults_form.general_gui_group.pf_color_button.setStyleSheet(
            "background-color:%s" % str(self.defaults['global_plot_fill'])[:7])
        self.general_defaults_form.general_gui_group.pf_color_alpha_spinner.set_value(
            int(self.defaults['global_plot_fill'][7:9], 16))
        self.general_defaults_form.general_gui_group.pf_color_alpha_slider.setValue(
            int(self.defaults['global_plot_fill'][7:9], 16))

        self.general_defaults_form.general_gui_group.pl_color_entry.set_value(self.defaults['global_plot_line'])
        self.general_defaults_form.general_gui_group.pl_color_button.setStyleSheet(
            "background-color:%s" % str(self.defaults['global_plot_line'])[:7])

        # Init Left-Right Selection colors
        self.general_defaults_form.general_gui_group.sf_color_entry.set_value(self.defaults['global_sel_fill'])
        self.general_defaults_form.general_gui_group.sf_color_button.setStyleSheet(
            "background-color:%s" % str(self.defaults['global_sel_fill'])[:7])
        self.general_defaults_form.general_gui_group.sf_color_alpha_spinner.set_value(
            int(self.defaults['global_sel_fill'][7:9], 16))
        self.general_defaults_form.general_gui_group.sf_color_alpha_slider.setValue(
            int(self.defaults['global_sel_fill'][7:9], 16))

        self.general_defaults_form.general_gui_group.sl_color_entry.set_value(self.defaults['global_sel_line'])
        self.general_defaults_form.general_gui_group.sl_color_button.setStyleSheet(
            "background-color:%s" % str(self.defaults['global_sel_line'])[:7])

        # Init Right-Left Selection colors
        self.general_defaults_form.general_gui_group.alt_sf_color_entry.set_value(self.defaults['global_alt_sel_fill'])
        self.general_defaults_form.general_gui_group.alt_sf_color_button.setStyleSheet(
            "background-color:%s" % str(self.defaults['global_alt_sel_fill'])[:7])
        self.general_defaults_form.general_gui_group.alt_sf_color_alpha_spinner.set_value(
            int(self.defaults['global_sel_fill'][7:9], 16))
        self.general_defaults_form.general_gui_group.alt_sf_color_alpha_slider.setValue(
            int(self.defaults['global_sel_fill'][7:9], 16))

        self.general_defaults_form.general_gui_group.alt_sl_color_entry.set_value(self.defaults['global_alt_sel_line'])
        self.general_defaults_form.general_gui_group.alt_sl_color_button.setStyleSheet(
            "background-color:%s" % str(self.defaults['global_alt_sel_line'])[:7])

        # Init Draw color and Selection Draw Color
        self.general_defaults_form.general_gui_group.draw_color_entry.set_value(self.defaults['global_draw_color'])
        self.general_defaults_form.general_gui_group.draw_color_button.setStyleSheet(
            "background-color:%s" % str(self.defaults['global_draw_color'])[:7])

        self.general_defaults_form.general_gui_group.sel_draw_color_entry.set_value(self.defaults['global_sel_draw_color'])
        self.general_defaults_form.general_gui_group.sel_draw_color_button.setStyleSheet(
            "background-color:%s" % str(self.defaults['global_sel_draw_color'])[:7])
        #### End of Data ####

        #### Plot Area ####
        start_plot_time = time.time()   # debug
        self.plotcanvas = PlotCanvas(self.ui.right_layout, self)

        self.plotcanvas.vis_connect('mouse_move', self.on_mouse_move_over_plot)
        self.plotcanvas.vis_connect('mouse_press', self.on_mouse_click_over_plot)
        self.plotcanvas.vis_connect('mouse_release', self.on_mouse_click_release_over_plot)
        self.plotcanvas.vis_connect('mouse_double_click', self.on_double_click_over_plot)

        # Keys over plot enabled
        self.plotcanvas.vis_connect('key_press', self.on_key_over_plot)
        self.plotcanvas.vis_connect('key_release', self.on_key_release_over_plot)

        self.ui.splitter.setStretchFactor(1, 2)

        # So it can receive key presses
        self.plotcanvas.vispy_canvas.native.setFocus()

        self.app_cursor = self.plotcanvas.new_cursor()
        self.app_cursor.enabled = False

        # to use for tools like Measurement tool who depends on the event sources who are changed inside the Editors
        # depending on from where those tools are called different actions can be done
        self.call_source = 'app'

        end_plot_time = time.time()
        self.log.debug("Finished Canvas initialization in %s seconds." % (str(end_plot_time - start_plot_time)))

        ### EDITOR section
        self.geo_editor = FlatCAMGeoEditor(self, disabled=True)
        self.exc_editor = FlatCAMExcEditor(self)

        # start with GRID activated
        self.ui.grid_snap_btn.trigger()
        self.ui.corner_snap_btn.setEnabled(False)
        self.ui.snap_max_dist_entry.setEnabled(False)
        self.ui.g_editor_cmenu.setEnabled(False)
        self.ui.e_editor_cmenu.setEnabled(False)

        #### Adjust tabs width ####
        # self.collection.view.setMinimumWidth(self.ui.options_scroll_area.widget().sizeHint().width() +
        #     self.ui.options_scroll_area.verticalScrollBar().sizeHint().width())
        self.collection.view.setMinimumWidth(290)

        self.log.debug("Finished adding Geometry and Excellon Editor's.")

        #### Worker ####
        self.workers = WorkerStack()
        self.worker_task.connect(self.workers.add_task)


        ### Signal handling ###
        ## Custom signals
        self.inform.connect(self.info)
        self.message.connect(self.message_dialog)
        self.progress.connect(self.set_progress_bar)
        self.object_created.connect(self.on_object_created)
        self.object_changed.connect(self.on_object_changed)
        self.object_plotted.connect(self.on_object_plotted)
        self.plots_updated.connect(self.on_plots_updated)
        self.file_opened.connect(self.register_recent)
        self.file_opened.connect(lambda kind, filename: self.register_folder(filename))
        self.file_saved.connect(lambda kind, filename: self.register_save_folder(filename))


        ## Standard signals
        # Menu
        self.ui.menufilenew.triggered.connect(self.on_file_new_click)
        self.ui.menufileopengerber.triggered.connect(self.on_fileopengerber)
        self.ui.menufileopengerber_follow.triggered.connect(self.on_fileopengerber_follow)
        self.ui.menufileopenexcellon.triggered.connect(self.on_fileopenexcellon)
        self.ui.menufileopengcode.triggered.connect(self.on_fileopengcode)
        self.ui.menufileopenproject.triggered.connect(self.on_file_openproject)
        self.ui.menufilerunscript.triggered.connect(self.on_filerunscript)

        self.ui.menufileimportsvg.triggered.connect(lambda: self.on_file_importsvg("geometry"))
        self.ui.menufileimportsvg_as_gerber.triggered.connect(lambda: self.on_file_importsvg("gerber"))

        self.ui.menufileimportdxf.triggered.connect(lambda: self.on_file_importdxf("geometry"))
        self.ui.menufileimportdxf_as_gerber.triggered.connect(lambda: self.on_file_importdxf("gerber"))

        self.ui.menufileexportsvg.triggered.connect(self.on_file_exportsvg)
        self.ui.menufileexportpng.triggered.connect(self.on_file_exportpng)
        self.ui.menufileexportexcellon.triggered.connect(lambda: self.on_file_exportexcellon(altium_format=None))
        self.ui.menufileexportexcellon_altium.triggered.connect(lambda: self.on_file_exportexcellon(altium_format=True))

        self.ui.menufileexportdxf.triggered.connect(self.on_file_exportdxf)

        self.ui.menufilesaveproject.triggered.connect(self.on_file_saveproject)
        self.ui.menufilesaveprojectas.triggered.connect(self.on_file_saveprojectas)
        self.ui.menufilesaveprojectcopy.triggered.connect(lambda: self.on_file_saveprojectas(make_copy=True))
        self.ui.menufilesavedefaults.triggered.connect(self.on_file_savedefaults)
        self.ui.menufile_exit.triggered.connect(self.on_app_exit)

        self.ui.menueditnew.triggered.connect(lambda: self.new_object('geometry', 'new_g', lambda x, y: None))
        self.ui.menueditnewexc.triggered.connect(self.new_excellon_object)
        self.ui.menueditedit.triggered.connect(self.object2editor)
        self.ui.menueditok.triggered.connect(self.editor2object)

        self.ui.menuedit_convertjoin.triggered.connect(self.on_edit_join)
        self.ui.menuedit_convertjoinexc.triggered.connect(self.on_edit_join_exc)
        self.ui.menuedit_convertjoingrb.triggered.connect(self.on_edit_join_grb)

        self.ui.menuedit_convert_sg2mg.triggered.connect(self.on_convert_singlegeo_to_multigeo)
        self.ui.menuedit_convert_mg2sg.triggered.connect(self.on_convert_multigeo_to_singlegeo)

        self.ui.menueditdelete.triggered.connect(self.on_delete)

        self.ui.menueditcopyobject.triggered.connect(self.on_copy_object)
        self.ui.menueditcopyobjectasgeom.triggered.connect(self.on_copy_object_as_geometry)
        self.ui.menueditorigin.triggered.connect(self.on_set_origin)
        self.ui.menueditjump.triggered.connect(self.on_jump_to)

        self.ui.menuedittoggleunits.triggered.connect(self.on_toggle_units_click)
        self.ui.menueditselectall.triggered.connect(self.on_selectall)
        self.ui.menueditpreferences.triggered.connect(self.on_preferences)

        # self.ui.menuoptions_transfer_a2o.triggered.connect(self.on_options_app2object)
        # self.ui.menuoptions_transfer_a2p.triggered.connect(self.on_options_app2project)
        # self.ui.menuoptions_transfer_o2a.triggered.connect(self.on_options_object2app)
        # self.ui.menuoptions_transfer_p2a.triggered.connect(self.on_options_project2app)
        # self.ui.menuoptions_transfer_o2p.triggered.connect(self.on_options_object2project)
        # self.ui.menuoptions_transfer_p2o.triggered.connect(self.on_options_project2object)

        self.ui.menuoptions_transform_rotate.triggered.connect(self.on_rotate)

        self.ui.menuoptions_transform_skewx.triggered.connect(self.on_skewx)
        self.ui.menuoptions_transform_skewy.triggered.connect(self.on_skewy)

        self.ui.menuoptions_transform_flipx.triggered.connect(self.on_flipx)
        self.ui.menuoptions_transform_flipy.triggered.connect(self.on_flipy)


        self.ui.menuviewdisableall.triggered.connect(lambda: self.disable_plots(self.collection.get_list()))
        self.ui.menuviewdisableother.triggered.connect(lambda: self.disable_plots(self.collection.get_non_selected()))
        self.ui.menuviewenable.triggered.connect(lambda: self.enable_plots(self.collection.get_list()))
        self.ui.menuview_zoom_fit.triggered.connect(self.on_zoom_fit)
        self.ui.menuview_zoom_in.triggered.connect(lambda: self.plotcanvas.zoom(1 / 1.5))
        self.ui.menuview_zoom_out.triggered.connect(lambda: self.plotcanvas.zoom(1.5))
        self.ui.menuview_toggle_grid.triggered.connect(self.on_toggle_grid)
        self.ui.menuview_toggle_axis.triggered.connect(self.on_toggle_axis)
        self.ui.menuview_toggle_workspace.triggered.connect(self.on_workspace_menu)

        self.ui.menutoolshell.triggered.connect(self.on_toggle_shell)

        self.ui.menuhelp_about.triggered.connect(self.on_about)
        self.ui.menuhelp_home.triggered.connect(lambda: webbrowser.open(self.app_url))
        self.ui.menuhelp_manual.triggered.connect(lambda: webbrowser.open(self.manual_url))
        self.ui.menuhelp_videohelp.triggered.connect(lambda: webbrowser.open(self.video_url))
        self.ui.menuhelp_shortcut_list.triggered.connect(self.on_shortcut_list)

        self.ui.menuprojectenable.triggered.connect(lambda: self.enable_plots(self.collection.get_selected()))
        self.ui.menuprojectdisable.triggered.connect(lambda: self.disable_plots(self.collection.get_selected()))
        self.ui.menuprojectgeneratecnc.triggered.connect(lambda: self.generate_cnc_job(self.collection.get_selected()))
        self.ui.menuprojectcopy.triggered.connect(self.on_copy_object)
        self.ui.menuprojectedit.triggered.connect(self.object2editor)

        self.ui.menuprojectdelete.triggered.connect(self.on_delete)
        self.ui.menuprojectproperties.triggered.connect(self.obj_properties)

        # Toolbar
        #self.ui.file_new_btn.triggered.connect(self.on_file_new)
        self.ui.file_open_btn.triggered.connect(self.on_file_openproject)
        self.ui.file_save_btn.triggered.connect(self.on_file_saveproject)
        self.ui.file_open_gerber_btn.triggered.connect(self.on_fileopengerber)
        self.ui.file_open_excellon_btn.triggered.connect(self.on_fileopenexcellon)

        self.ui.clear_plot_btn.triggered.connect(self.clear_plots)
        self.ui.replot_btn.triggered.connect(self.plot_all)
        self.ui.zoom_fit_btn.triggered.connect(self.on_zoom_fit)
        self.ui.zoom_in_btn.triggered.connect(lambda: self.plotcanvas.zoom(1 / 1.5))
        self.ui.zoom_out_btn.triggered.connect(lambda: self.plotcanvas.zoom(1.5))

        self.ui.newgeo_btn.triggered.connect(lambda: self.new_object('geometry', 'new_g', lambda x, y: None))
        self.ui.newexc_btn.triggered.connect(self.new_excellon_object)
        self.ui.editgeo_btn.triggered.connect(self.object2editor)
        self.ui.update_obj_btn.triggered.connect(self.editor2object)
        self.ui.delete_btn.triggered.connect(self.on_delete)
        self.ui.shell_btn.triggered.connect(self.on_toggle_shell)

        # Context Menu
        self.ui.popmenu_new_geo.triggered.connect(lambda: self.new_object('geometry', 'new_g', lambda x, y: None))
        self.ui.popmenu_new_exc.triggered.connect(self.new_excellon_object)
        self.ui.popmenu_new_prj.triggered.connect(self.on_file_new)

        self.ui.gridmenu_1.triggered.connect(lambda: self.ui.grid_gap_x_entry.setText("0.05"))
        self.ui.gridmenu_2.triggered.connect(lambda: self.ui.grid_gap_x_entry.setText("0.1"))
        self.ui.gridmenu_3.triggered.connect(lambda: self.ui.grid_gap_x_entry.setText("0.2"))
        self.ui.gridmenu_4.triggered.connect(lambda: self.ui.grid_gap_x_entry.setText("0.5"))
        self.ui.gridmenu_5.triggered.connect(lambda: self.ui.grid_gap_x_entry.setText("1.0"))
        self.ui.draw_line.triggered.connect(self.geo_editor.draw_tool_path)
        self.ui.draw_rect.triggered.connect(self.geo_editor.draw_tool_rectangle)
        self.ui.draw_cut.triggered.connect(self.geo_editor.cutpath)
        self.ui.draw_move.triggered.connect(self.geo_editor.on_move)
        self.ui.drill.triggered.connect(self.exc_editor.exc_add_drill)
        self.ui.drill_array.triggered.connect(self.exc_editor.exc_add_drill_array)
        self.ui.drill_copy.triggered.connect(self.exc_editor.exc_copy_drills)


        self.ui.zoomfit.triggered.connect(self.on_zoom_fit)
        self.ui.clearplot.triggered.connect(self.clear_plots)
        self.ui.replot.triggered.connect(self.plot_all)

        self.ui.popmenu_copy.triggered.connect(self.on_copy_object)
        self.ui.popmenu_delete.triggered.connect(self.on_delete)
        self.ui.popmenu_edit.triggered.connect(self.object2editor)
        self.ui.popmenu_save.triggered.connect(self.editor2object)
        self.ui.popmenu_move.triggered.connect(self.obj_move)

        self.ui.popmenu_properties.triggered.connect(self.obj_properties)

        # Preferences Plot Area TAB
        self.ui.options_combo.activated.connect(self.on_options_combo_change)
        self.ui.pref_save_button.clicked.connect(self.on_save_button)
        self.ui.pref_import_button.clicked.connect(self.on_import_preferences)
        self.ui.pref_export_button.clicked.connect(self.on_export_preferences)
        self.ui.pref_open_button.clicked.connect(self.on_preferences_open_folder)

        ###############################
        ### GUI PREFERENCES SIGNALS ###
        ###############################
        self.general_options_form.general_app_group.units_radio.group_toggle_fn = self.on_toggle_units
        self.general_defaults_form.general_app_group.language_apply_btn.clicked.connect(self.on_language_apply)

        ###############################
        ### GUI PREFERENCES SIGNALS ###
        ###############################

        # Setting plot colors signals
        self.general_defaults_form.general_gui_group.pf_color_entry.editingFinished.connect(self.on_pf_color_entry)
        self.general_defaults_form.general_gui_group.pf_color_button.clicked.connect(self.on_pf_color_button)
        self.general_defaults_form.general_gui_group.pf_color_alpha_spinner.valueChanged.connect(self.on_pf_color_spinner)
        self.general_defaults_form.general_gui_group.pf_color_alpha_slider.valueChanged.connect(self.on_pf_color_slider)
        self.general_defaults_form.general_gui_group.pl_color_entry.editingFinished.connect(self.on_pl_color_entry)
        self.general_defaults_form.general_gui_group.pl_color_button.clicked.connect(self.on_pl_color_button)
        # Setting selection (left - right) colors signals
        self.general_defaults_form.general_gui_group.sf_color_entry.editingFinished.connect(self.on_sf_color_entry)
        self.general_defaults_form.general_gui_group.sf_color_button.clicked.connect(self.on_sf_color_button)
        self.general_defaults_form.general_gui_group.sf_color_alpha_spinner.valueChanged.connect(self.on_sf_color_spinner)
        self.general_defaults_form.general_gui_group.sf_color_alpha_slider.valueChanged.connect(self.on_sf_color_slider)
        self.general_defaults_form.general_gui_group.sl_color_entry.editingFinished.connect(self.on_sl_color_entry)
        self.general_defaults_form.general_gui_group.sl_color_button.clicked.connect(self.on_sl_color_button)
        # Setting selection (right - left) colors signals
        self.general_defaults_form.general_gui_group.alt_sf_color_entry.editingFinished.connect(self.on_alt_sf_color_entry)
        self.general_defaults_form.general_gui_group.alt_sf_color_button.clicked.connect(self.on_alt_sf_color_button)
        self.general_defaults_form.general_gui_group.alt_sf_color_alpha_spinner.valueChanged.connect(
            self.on_alt_sf_color_spinner)
        self.general_defaults_form.general_gui_group.alt_sf_color_alpha_slider.valueChanged.connect(
            self.on_alt_sf_color_slider)
        self.general_defaults_form.general_gui_group.alt_sl_color_entry.editingFinished.connect(self.on_alt_sl_color_entry)
        self.general_defaults_form.general_gui_group.alt_sl_color_button.clicked.connect(self.on_alt_sl_color_button)
        # Setting Editor Draw colors signals
        self.general_defaults_form.general_gui_group.draw_color_entry.editingFinished.connect(self.on_draw_color_entry)
        self.general_defaults_form.general_gui_group.draw_color_button.clicked.connect(self.on_draw_color_button)

        self.general_defaults_form.general_gui_group.sel_draw_color_entry.editingFinished.connect(self.on_sel_draw_color_entry)
        self.general_defaults_form.general_gui_group.sel_draw_color_button.clicked.connect(self.on_sel_draw_color_button)

        self.general_defaults_form.general_gui_group.wk_cb.currentIndexChanged.connect(self.on_workspace_modified)
        self.general_defaults_form.general_gui_group.workspace_cb.stateChanged.connect(self.on_workspace)


        # Modify G-CODE Plot Area TAB
        self.ui.code_editor.textChanged.connect(self.handleTextChanged)
        self.ui.buttonOpen.clicked.connect(self.handleOpen)
        self.ui.buttonPrint.clicked.connect(self.handlePrint)
        self.ui.buttonPreview.clicked.connect(self.handlePreview)
        self.ui.buttonSave.clicked.connect(self.handleSaveGCode)
        self.ui.buttonFind.clicked.connect(self.handleFindGCode)
        self.ui.buttonReplace.clicked.connect(self.handleReplaceGCode)

        # Object list
        self.collection.view.activated.connect(self.on_row_activated)

        # Monitor the checkbox from the Application Defaults Tab and show the TCL shell or not depending on it's value
        self.general_defaults_form.general_app_group.shell_startup_cb.clicked.connect(self.on_toggle_shell)

        # Load the defaults values into the Excellon Format and Excellon Zeros fields
        self.excellon_defaults_form.excellon_opt_group.excellon_defaults_button.clicked.connect(
            self.on_excellon_defaults_button)

        # Load the defaults values into the Excellon Format and Excellon Zeros fields
        self.excellon_options_form.excellon_opt_group.excellon_defaults_button.clicked.connect(
            self.on_excellon_options_button)

        # this is a flag to signal to other tools that the ui tooltab is locked and not accessible
        self.tool_tab_locked = False

        ####################
        ### Other setups ###
        ####################
        # Sets up FlatCAMObj, FCProcess and FCProcessContainer.
        self.setup_obj_classes()

        self.setup_recent_items()
        self.setup_component_editor()

        #############
        ### Shell ###
        #############

        ###
        # Auto-complete KEYWORDS
        self.tcl_commands_list = ['add_circle', 'add_poly', 'add_polygon', 'add_polyline', 'add_rectangle',
                                  'aligndrill', 'clear',
                                  'aligndrillgrid', 'cncjob', 'cutout', 'cutout_any', 'delete', 'drillcncjob',
                                  'export_gcode',
                                  'export_svg', 'ext', 'exteriors', 'follow', 'geo_union', 'geocutout', 'get_names',
                                  'get_sys', 'getsys', 'help', 'import_svg', 'interiors', 'isolate', 'join_excellon',
                                  'join_excellons', 'join_geometries', 'join_geometry', 'list_sys', 'listsys', 'mill',
                                  'millholes', 'mirror', 'new', 'new_geometry', 'offset', 'open_excellon', 'open_gcode',
                                  'open_gerber', 'open_project', 'options', 'paint', 'pan', 'panel', 'panelize', 'plot',
                                  'save', 'save_project', 'save_sys', 'scale', 'set_active', 'set_sys', 'setsys',
                                  'skew', 'subtract_poly', 'subtract_rectangle', 'version', 'write_gcode'
                              ]

        self.ordinary_keywords = ['name', 'center_x', 'center_y', 'radius', 'x0', 'y0', 'x1', 'y1', 'box', 'axis',
                                  'holes','grid', 'minoffset', 'gridoffset','axisoffset', 'dia', 'dist', 'gridoffsetx',
                                  'gridoffsety', 'columns', 'rows', 'z_cut', 'z_move', 'feedrate', 'feedrate_rapid',
                                  'tooldia', 'multidepth', 'extracut', 'depthperpass', 'ppname_g', 'outname', 'margin',
                                  'gaps', 'gapsize', 'tools', 'drillz', 'travelz', 'spindlespeed', 'toolchange',
                                  'toolchangez', 'endz', 'ppname_e', 'opt_type', 'preamble', 'postamble', 'filename',
                                  'scale_factor', 'type', 'passes', 'overlap', 'combine', 'use_threads', 'x', 'y',
                                  'follow', 'all', 'spacing_columns', 'spacing_rows', 'factor', 'value', 'angle_x',
                                  'angle_y', 'gridx', 'gridy', 'True', 'False'
                             ]

        self.myKeywords = self.tcl_commands_list + self.ordinary_keywords

        self.shell = FCShell(self, version=self.version)
        self.shell._edit.set_model_data(self.myKeywords)
        self.shell.setWindowIcon(self.ui.app_icon)
        self.shell.setWindowTitle("FlatCAM Shell")
        self.shell.resize(*self.defaults["global_shell_shape"])
        self.shell.append_output("FlatCAM %s (c)2014-2019 Juan Pablo Caram " % self.version)
        self.shell.append_output("(Type help to get started)\n\n")

        self.init_tcl()

        self.ui.shell_dock = QtWidgets.QDockWidget("FlatCAM TCL Shell")
        self.ui.shell_dock.setWidget(self.shell)
        self.ui.shell_dock.setAllowedAreas(QtCore.Qt.AllDockWidgetAreas)
        self.ui.shell_dock.setFeatures(QtWidgets.QDockWidget.DockWidgetMovable |
                                       QtWidgets.QDockWidget.DockWidgetFloatable |
                                       QtWidgets.QDockWidget.DockWidgetClosable)
        self.ui.addDockWidget(QtCore.Qt.BottomDockWidgetArea, self.ui.shell_dock)

        # show TCL shell at start-up based on the Menu -? Edit -> Preferences setting.
        if self.defaults["global_shell_at_startup"]:
            self.ui.shell_dock.show()
        else:
            self.ui.shell_dock.hide()

        #########################
        ### Tools and Plugins ###
        #########################

        # always install tools only after the shell is initialized because the self.inform.emit() depends on shell
        self.install_tools()

        ### System Font Parsing ###
        # self.f_parse = ParseFont(self)
        # self.parse_system_fonts()

        # test if the program was started with a script as parameter
        if self.cmd_line_shellfile:
            try:
                with open(self.cmd_line_shellfile, "r") as myfile:
                    cmd_line_shellfile_text = myfile.read()
                    self.shell._sysShell.exec_command(cmd_line_shellfile_text)
            except Exception as ext:
                print("ERROR: ", ext)
                sys.exit(2)

        ###########################
        #### Check for updates ####
        ###########################

        # Separate thread (Not worker)
        # Check for updates on startup but only if the user consent and the app is not in Beta version
        if (self.beta is False or self.beta is None) and \
                self.general_defaults_form.general_gui_group.version_check_cb.get_value() is True:
            App.log.info("Checking for updates in backgroud (this is version %s)." % str(self.version))

            self.thr2 = QtCore.QThread()
            self.worker_task.emit({'fcn': self.version_check,
                                   'params': []})
            self.thr2.start()


        ####################################
        #### Variables for global usage ####
        ####################################

        # coordinates for relative position display
        self.rel_point1 = (0, 0)
        self.rel_point2 = (0, 0)

        # variable to store coordinates
        self.pos = (0, 0)
        self.pos_jump = (0, 0)

        # variable to store if there was motion before right mouse button click (panning)
        self.panning_action = False
        # variable to store if a command is active (then the var is not None) and which one it is
        self.command_active = None
        # variable to store the status of moving selection action
        # None value means that it's not an selection action
        # True value = a selection from left to right
        # False value = a selection from right to left
        self.selection_type = None

        # List to store the objects that are currently loaded in FlatCAM
        # This list is updated on each object creation or object delete
        self.all_objects_list = []

        # List to store the objects that are selected
        self.sel_objects_list = []

        # holds the key modifier if pressed (CTRL, SHIFT or ALT)
        self.key_modifiers = None

        # Variable to hold the status of the axis
        self.toggle_axis = True

        self.cursor = None

        # Variable to store the GCODE that was edited
        self.gcode_edited = ""

        self.grb_list = ['gbr', 'ger', 'gtl', 'gbl', 'gts', 'gbs', 'gtp', 'gbp', 'gto', 'gbo', 'gm1', 'gm2', 'gm3', 'gko',
                    'cmp', 'sol', 'stc', 'sts', 'plc', 'pls', 'crc', 'crs', 'tsm', 'bsm', 'ly2', 'ly15', 'dim', 'mil',
                    'grb', 'top', 'bot', 'smt', 'smb', 'sst', 'ssb', 'spt', 'spb', 'pho', 'gdo', 'art', 'gbd']
        self.exc_list = ['drl', 'txt', 'xln', 'drd', 'tap', 'exc']
        self.gcode_list = ['nc', 'ncc', 'tap', 'gcode', 'cnc', 'ecs', 'fnc', 'dnc', 'ncg', 'gc', 'fan', 'fgc', 'din',
                      'xpi', 'hnc', 'h', 'i', 'ncp', 'min', 'gcd', 'rol', 'mpr', 'ply', 'out', 'eia', 'plt', 'sbp',
                      'mpf']
        self.svg_list = ['svg']
        self.dxf_list = ['dxf']
        self.prj_list = ['flatprj']

        # global variable used by NCC Tool to signal that some polygons could not be cleared, if True
        # flag for polygons not cleared
        self.poly_not_cleared = False

        ### Save defaults to factory_defaults.FlatConfig file ###
        ### It's done only once after install #############
        factory_file = open(self.data_path + '/factory_defaults.FlatConfig')
        fac_def_from_file = factory_file.read()
        factory_defaults = json.loads(fac_def_from_file)

        # if the file contain an empty dictionary then save the factory defaults into the file
        if not factory_defaults:
            self.save_factory_defaults(silent=False)
        factory_file.close()
        # and then make the  factory_defaults.FlatConfig file read_only os it can't be modified after creation.
        filename_factory = self.data_path + '/factory_defaults.FlatConfig'
        os.chmod(filename_factory, S_IREAD | S_IRGRP | S_IROTH)

        # Post-GUI initialization: Experimental attempt
        # to perform unit tests on the GUI.
        # if post_gui is not None:
        #     post_gui(self)

        App.log.debug("END of constructor. Releasing control.")

        # accept a project file as command line parameter
        # the path/file_name must be enclosed in quotes if it contain spaces
        for argument in App.args:
            if '.FlatPrj' in argument:
                try:
                    project_name = str(argument)

                    if project_name == "":
                        self.inform.emit("Open cancelled.")
                    else:
                        # self.open_project(project_name)
                        run_from_arg = True
                        self.worker_task.emit({'fcn': self.open_project,
                                               'params': [project_name, run_from_arg]})
                except Exception as e:
                    log.debug("Could not open FlatCAM project file as App parameter due: %s" % str(e))

    def defaults_read_form(self):
        for option in self.defaults_form_fields:
            try:
                self.defaults[option] = self.defaults_form_fields[option].get_value()
            except:
                pass

    def defaults_write_form(self):
        for option in self.defaults:
            self.defaults_write_form_field(option)
            # try:
            #     self.defaults_form_fields[option].set_value(self.defaults[option])
            # except KeyError:
            #     #self.log.debug("defaults_write_form(): No field for: %s" % option)
            #     # TODO: Rethink this?
            #     pass

    def defaults_write_form_field(self, field):
        try:
            self.defaults_form_fields[field].set_value(self.defaults[field])
        except KeyError:
            #self.log.debug("defaults_write_form(): No field for: %s" % option)
            # TODO: Rethink this?
            pass

    def clear_pool(self):
        self.pool.close()

        self.pool = Pool()
        self.pool_recreated.emit(self.pool)

        gc.collect()

    # the order that the tools are installed is important as they can depend on each other install position
    def install_tools(self):
        self.dblsidedtool = DblSidedTool(self)
        self.dblsidedtool.install(icon=QtGui.QIcon('share/doubleside16.png'), separator=True)

        self.measurement_tool = Measurement(self)
        self.measurement_tool.install(icon=QtGui.QIcon('share/measure16.png'), separator=True)

        self.panelize_tool = Panelize(self)
        self.panelize_tool.install(icon=QtGui.QIcon('share/panel16.png'))

        self.film_tool = Film(self)
        self.film_tool.install(icon=QtGui.QIcon('share/film16.png'), separator=True)

        self.move_tool = ToolMove(self)
        self.move_tool.install(icon=QtGui.QIcon('share/move16.png'), pos=self.ui.menuedit,
                               before=self.ui.menueditorigin)

        self.cutout_tool = ToolCutout(self)
        self.cutout_tool.install(icon=QtGui.QIcon('share/cut16.png'), pos=self.ui.menutool,
                                 before=self.measurement_tool.menuAction)

        self.ncclear_tool = NonCopperClear(self)
        self.ncclear_tool.install(icon=QtGui.QIcon('share/flatcam_icon16.png'), pos=self.ui.menutool,
                                 before=self.measurement_tool.menuAction, separator=True)

        self.paint_tool = ToolPaint(self)
        self.paint_tool.install(icon=QtGui.QIcon('share/paint16.png'), pos=self.ui.menutool,
                                  before=self.measurement_tool.menuAction, separator=True)

        self.calculator_tool = ToolCalculator(self)
        self.calculator_tool.install(icon=QtGui.QIcon('share/calculator24.png'))

        self.transform_tool = ToolTransform(self)
        self.transform_tool.install(icon=QtGui.QIcon('share/transform.png'), pos=self.ui.menuoptions, separator=True)

        self.properties_tool = Properties(self)
        self.properties_tool.install(icon=QtGui.QIcon('share/properties32.png'), pos=self.ui.menuoptions)

        self.image_tool = ToolImage(self)
        self.image_tool.install(icon=QtGui.QIcon('share/image32.png'), pos=self.ui.menufileimport,
                                separator=True)

        self.log.debug("Tools are installed.")

    def init_tools(self):

        # delete the data currently in the Tools Tab and the Tab itself
        widget = QtWidgets.QTabWidget.widget(self.ui.notebook, 2)
        if widget is not None:
            widget.deleteLater()
        self.ui.notebook.removeTab(2)

        # rebuild the Tools Tab
        self.ui.tool_tab = QtWidgets.QWidget()
        self.ui.tool_tab_layout = QtWidgets.QVBoxLayout(self.ui.tool_tab)
        self.ui.tool_tab_layout.setContentsMargins(2, 2, 2, 2)
        self.ui.notebook.addTab(self.ui.tool_tab, "Tool")
        self.ui.tool_scroll_area = VerticalScrollArea()
        self.ui.tool_tab_layout.addWidget(self.ui.tool_scroll_area)

        # reinstall all the Tools as some may have been removed when the data was removed from the Tools Tab
        self.install_tools()
        self.log.debug("Tools are initialized.")

    # def parse_system_fonts(self):
    #     self.worker_task.emit({'fcn': self.f_parse.get_fonts_by_types,
    #                            'params': []})

    def object2editor(self):
        """
        Send the current Geometry or Excellon object (if any) into the editor.

        :return: None
        """

        # adjust the visibility of some of the canvas context menu
        self.ui.popmenu_edit.setVisible(False)
        self.ui.popmenu_save.setVisible(True)

        if isinstance(self.collection.get_active(), FlatCAMGeometry):
            edited_object = self.collection.get_active()
            # for now, if the Geometry is MultiGeo do not allow the editing
            if edited_object.multigeo is True:
                self.inform.emit("[warning_notcl]Editing a MultiGeo Geometry is not possible for the moment.")
                return
            self.ui.update_obj_btn.setEnabled(True)
            self.geo_editor.edit_fcgeometry(edited_object)
            self.ui.g_editor_cmenu.setEnabled(True)
            # set call source to the Editor we go into
            self.call_source = 'geo_editor'

            # prevent the user to change anything in the Selected Tab while the Geo Editor is active
            sel_tab_widget_list = self.ui.selected_tab.findChildren(QtWidgets.QWidget)
            for w in sel_tab_widget_list:
                w.setEnabled(False)
        elif isinstance(self.collection.get_active(), FlatCAMExcellon):
            self.ui.update_obj_btn.setEnabled(True)
            self.exc_editor.edit_exc_obj(self.collection.get_active())
            self.ui.e_editor_cmenu.setEnabled(True)
            # set call source to the Editor we go into
            self.call_source = 'exc_editor'
        else:
            self.inform.emit("[warning_notcl]Select a Geometry or Excellon Object to edit.")
            return

        # make sure that we can't select another object while in Editor Mode:
        self.collection.view.setSelectionMode(QtWidgets.QAbstractItemView.NoSelection)

        # delete any selection shape that might be active as they are not relevant in Editor
        self.delete_selection_shape()


        self.ui.plot_tab_area.setTabText(0, "EDITOR Area")
        self.inform.emit("[warning_notcl]Editor is activated ...")

    def editor2object(self):
        """
        Transfers the Geometry or Excellon from the editor to the current object.

        :return: None
        """

        # adjust the visibility of some of the canvas context menu
        self.ui.popmenu_edit.setVisible(True)
        self.ui.popmenu_save.setVisible(False)

        edited_obj = self.collection.get_active()
        obj_type = ""

        if isinstance(edited_obj, FlatCAMGeometry):
            obj_type = "Geometry"
            self.geo_editor.update_fcgeometry(edited_obj)
            self.geo_editor.update_options(edited_obj)

            self.geo_editor.deactivate()

            # edited_obj.on_tool_delete(all=True)
            # edited_obj.on_tool_add(dia=edited_obj.options['cnctooldia'])

            self.ui.corner_snap_btn.setEnabled(False)
            self.ui.update_obj_btn.setEnabled(False)
            self.ui.g_editor_cmenu.setEnabled(False)
            self.ui.e_editor_cmenu.setEnabled(False)

            # update the geo object options so it is including the bounding box values
            try:
                xmin, ymin, xmax, ymax = edited_obj.bounds()
                edited_obj.options['xmin'] = xmin
                edited_obj.options['ymin'] = ymin
                edited_obj.options['xmax'] = xmax
                edited_obj.options['ymax'] = ymax
            except AttributeError:
                self.inform.emit("[warning] Object empty after edit.")

        elif isinstance(edited_obj, FlatCAMExcellon):
            obj_type = "Excellon"

            self.exc_editor.update_exc_obj(edited_obj)

            self.exc_editor.deactivate()
            self.ui.corner_snap_btn.setEnabled(False)
            self.ui.update_obj_btn.setEnabled(False)
            self.ui.g_editor_cmenu.setEnabled(False)
            self.ui.e_editor_cmenu.setEnabled(False)

        else:
            self.inform.emit("[warning_notcl]Select a Geometry or Excellon Object to update.")
            return

        # restore the call_source to app
        self.call_source = 'app'

        edited_obj.plot()
        self.ui.plot_tab_area.setTabText(0, "Plot Area")
        self.inform.emit("[success] %s is updated, returning to App..." % obj_type)

        # reset the Object UI to original settings
        # edited_obj.set_ui(edited_obj.ui_type())
        # edited_obj.build_ui()
        # make sure that we reenable the selection on Project Tab after returning from Editor Mode:
        self.collection.view.setSelectionMode(QtWidgets.QAbstractItemView.ExtendedSelection)


    def get_last_folder(self):
        return self.defaults["global_last_folder"]

    def get_last_save_folder(self):
        return self.defaults["global_last_save_folder"]

    def report_usage(self, resource):
        """
        Increments usage counter for the given resource
        in self.defaults['global_stats'].

        :param resource: Name of the resource.
        :return: None
        """

        if resource in self.defaults['global_stats']:
            self.defaults['global_stats'][resource] += 1
        else:
            self.defaults['global_stats'][resource] = 1

    def init_tcl(self):
        if hasattr(self,'tcl'):
            # self.tcl = None
            # TODO  we need  to clean  non default variables and procedures here
            # new object cannot be used here as it  will not remember values created for next passes,
            # because tcl  was execudted in old instance of TCL
            pass
        else:
            self.tcl = tk.Tcl()
            self.setup_shell()
        self.log.debug("TCL Shell has been initialized.")

    # TODO: This shouldn't be here.
    class TclErrorException(Exception):
        """
        this exception is deffined here, to be able catch it if we sucessfully handle all errors from shell command
        """
        pass

    def shell_message(self, msg, show=False, error=False):
        """
        Shows a message on the FlatCAM Shell

        :param msg: Message to display.
        :param show: Opens the shell.
        :param error: Shows the message as an error.
        :return: None
        """
        if show:
            self.ui.shell_dock.show()
        try:
            if error:
                self.shell.append_error(msg + "\n")
            else:
                self.shell.append_output(msg + "\n")
        except AttributeError:
            log.debug("shell_message() is called before Shell Class is instantiated. The message is: %s", str(msg))

    def raise_tcl_unknown_error(self, unknownException):
        """
        Raise exception if is different type than TclErrorException
        this is here mainly to show unknown errors inside TCL shell console.

        :param unknownException:
        :return:
        """

        if not isinstance(unknownException, self.TclErrorException):
            self.raise_tcl_error("Unknown error: %s" % str(unknownException))
        else:
            raise unknownException

    def display_tcl_error(self, error, error_info=None):
        """
        escape bracket [ with \  otherwise there is error
        "ERROR: missing close-bracket" instead of real error
        :param error: it may be text  or exception
        :return: None
        """

        if isinstance(error, Exception):

            exc_type, exc_value, exc_traceback = error_info
            if not isinstance(error, self.TclErrorException):
                show_trace = 1
            else:
                show_trace = int(self.defaults['global_verbose_error_level'])

            if show_trace > 0:
                trc = traceback.format_list(traceback.extract_tb(exc_traceback))
                trc_formated = []
                for a in reversed(trc):
                    trc_formated.append(a.replace("    ", " > ").replace("\n", ""))
                text = "%s\nPython traceback: %s\n%s" % (exc_value,
                                 exc_type,
                                 "\n".join(trc_formated))

            else:
                text = "%s" % error
        else:
            text = error

        text = text.replace('[', '\\[').replace('"', '\\"')

        self.tcl.eval('return -code error "%s"' % text)

    def raise_tcl_error(self, text):
        """
        this method  pass exception from python into TCL as error, so we get stacktrace and reason
        :param text: text of error
        :return: raise exception
        """

        self.display_tcl_error(text)
        raise self.TclErrorException(text)

    def exec_command(self, text):
        """
        Handles input from the shell. See FlatCAMApp.setup_shell for shell commands.
        Also handles execution in separated threads

        :param text:
        :return: output if there was any
        """

        self.report_usage('exec_command')

        result = self.exec_command_test(text, False)

        #MS: added this method call so the geometry is updated once the TCL
        #command is executed
        self.plot_all()

        return result

    def exec_command_test(self, text, reraise=True):
        """
        Same as exec_command(...) with additional control over  exceptions.
        Handles input from the shell. See FlatCAMApp.setup_shell for shell commands.

        :param text: Input command
        :param reraise: Re-raise TclError exceptions in Python (mostly for unitttests).
        :return: Output from the command
        """

        text = str(text)

        try:
            self.shell.open_proccessing()  # Disables input box.
            result = self.tcl.eval(str(text))
            if result != 'None':
                self.shell.append_output(result + '\n')

        except tk.TclError as e:
            # This will display more precise answer if something in TCL shell fails
            result = self.tcl.eval("set errorInfo")
            self.log.error("Exec command Exception: %s" % (result + '\n'))
            self.shell.append_error('ERROR: ' + result + '\n')
            # Show error in console and just return or in test raise exception
            if reraise:
                raise e

        finally:
            self.shell.close_proccessing()
            pass
        return result

        # """
        # Code below is unsused. Saved for later.
        # """

        # parts = re.findall(r'([\w\\:\.]+|".*?")+', text)
        # parts = [p.replace('\n', '').replace('"', '') for p in parts]
        # self.log.debug(parts)
        # try:
        #     if parts[0] not in commands:
        #         self.shell.append_error("Unknown command\n")
        #         return
        #
        #     #import inspect
        #     #inspect.getargspec(someMethod)
        #     if (type(commands[parts[0]]["params"]) is not list and len(parts)-1 != commands[parts[0]]["params"]) or \
        #             (type(commands[parts[0]]["params"]) is list and len(parts)-1 not in commands[parts[0]]["params"]):
        #         self.shell.append_error(
        #             "Command %s takes %d arguments. %d given.\n" %
        #             (parts[0], commands[parts[0]]["params"], len(parts)-1)
        #         )
        #         return
        #
        #     cmdfcn = commands[parts[0]]["fcn"]
        #     cmdconv = commands[parts[0]]["converters"]
        #     if len(parts) - 1 > 0:
        #         retval = cmdfcn(*[cmdconv[i](parts[i + 1]) for i in range(len(parts)-1)])
        #     else:
        #         retval = cmdfcn()
        #     retfcn = commands[parts[0]]["retfcn"]
        #     if retval and retfcn(retval):
        #         self.shell.append_output(retfcn(retval) + "\n")
        #
        # except Exception as e:
        #     #self.shell.append_error(''.join(traceback.format_exc()))
        #     #self.shell.append_error("?\n")
        #     self.shell.append_error(str(e) + "\n")

    def info(self, msg):
        """
        Informs the user. Normally on the status bar, optionally
        also on the shell.

        :param msg: Text to write.
        :return: None
        """

        # Type of message in brackets at the begining of the message.
        match = re.search("\[([^\]]+)\](.*)", msg)
        if match:
            level = match.group(1)
            msg_ = match.group(2)
            self.ui.fcinfo.set_status(str(msg_), level=level)

            if level == "error" or level == "warning":
                self.shell_message(msg, error=True, show=True)
            elif level == "error_notcl" or level == "warning_notcl":
                self.shell_message(msg, error=True, show=False)
            else:
                self.shell_message(msg, error=False, show=False)
        else:
            self.ui.fcinfo.set_status(str(msg), level="info")

            # make sure that if the message is to clear the infobar with a space
            # is not printed over and over on the shell
            if msg != '':
                self.shell_message(msg)

    def restore_toolbar_view(self):
        tb = self.defaults["global_toolbar_view"]
        if tb & 1:
            self.ui.toolbarfile.setVisible(True)
        else:
            self.ui.toolbarfile.setVisible(False)

        if tb & 2:
            self.ui.toolbargeo.setVisible(True)
        else:
            self.ui.toolbargeo.setVisible(False)

        if tb & 4:
            self.ui.toolbarview.setVisible(True)
        else:
            self.ui.toolbarview.setVisible(False)

        if tb & 8:
            self.ui.toolbartools.setVisible(True)
        else:
            self.ui.toolbartools.setVisible(False)

        if tb & 16:
            self.ui.snap_toolbar.setVisible(True)
        else:
            self.ui.snap_toolbar.setVisible(False)

    def load_defaults(self, filename):
        """
        Loads the aplication's default settings from current_defaults.FlatConfig into
        ``self.defaults``.

        :return: None
        """
        try:
            f = open(self.data_path + "/" + filename + ".FlatConfig")
            options = f.read()
            f.close()
        except IOError:
            self.log.error("Could not load defaults file.")
            self.inform.emit("[error] Could not load defaults file.")
            # in case the defaults file can't be loaded, show all toolbars
            self.defaults["global_toolbar_view"] = 31
            return

        try:
            defaults = json.loads(options)
        except:
            # in case the defaults file can't be loaded, show all toolbars
            self.defaults["global_toolbar_view"] = 31
            e = sys.exc_info()[0]
            App.log.error(str(e))
            self.inform.emit("[error] Failed to parse defaults file.")
            return
        self.defaults.update(defaults)
        log.debug("FlatCAM defaults loaded from: %s" % filename)

        # restore the toolbar view
        self.restore_toolbar_view()

    def on_import_preferences(self):
        """
        Loads the aplication's factory default settings from factory_defaults.FlatConfig into
        ``self.defaults``.

        :return: None
        """

        self.report_usage("on_import_preferences")
        App.log.debug("on_import_preferences()")

        filter = "Config File (*.FlatConfig);;All Files (*.*)"
        try:
            filename, _ = QtWidgets.QFileDialog.getOpenFileName(caption="Import FlatCAM Preferences",
                                                                directory=self.data_path, filter=filter)
        except TypeError:
            filename, _ = QtWidgets.QFileDialog.getOpenFileName(caption="Import FlatCAM Preferences", filter=filter)

        filename = str(filename)

        if filename == "":
            self.inform.emit("[warning_notcl]FlatCAM preferences import cancelled.")
        else:
            try:
                f = open(filename)
                options = f.read()
                f.close()
            except IOError:
                self.log.error("Could not load defaults file.")
                self.inform.emit("[error_notcl] Could not load defaults file.")
                return

            try:
                defaults_from_file = json.loads(options)
            except:
                e = sys.exc_info()[0]
                App.log.error(str(e))
                self.inform.emit("[error_notcl] Failed to parse defaults file.")
                return
            self.defaults.update(defaults_from_file)
            self.inform.emit("[success]Imported Defaults from %s" %filename)

    def on_export_preferences(self):

        self.report_usage("on_export_preferences")
        App.log.debug("on_export_preferences()")

        filter = "Config File (*.FlatConfig);;All Files (*.*)"
        try:
            filename, _ = QtWidgets.QFileDialog.getSaveFileName(caption="Export FlatCAM Preferences",
                                                                directory=self.data_path, filter=filter)
        except TypeError:
            filename, _ = QtWidgets.QFileDialog.getSaveFileName(caption="Export FlatCAM Preferences", filter=filter)

        filename = str(filename)
        defaults_from_file = {}

        if filename == "":
            self.inform.emit("[warning_notcl]FlatCAM preferences export cancelled.")
            return
        else:
            try:
                f = open(filename, 'w')
                defaults_file_content = f.read()
                f.close()
            except IOError:
                App.log.debug('Creating a new preferences file ...')
                f = open(filename, 'w')
                json.dump({}, f)
                f.close()
            except:
                e = sys.exc_info()[0]
                App.log.error("Could not load defaults file.")
                App.log.error(str(e))
                self.inform.emit("[error_notcl]Could not load defaults file.")
                return

            try:
                defaults_from_file = json.loads(defaults_file_content)
            except:
                App.log.warning("Trying to read an empty Preferences file. Continue.")

            # Update options
            self.defaults_read_form()
            defaults_from_file.update(self.defaults)
            self.propagate_defaults(silent=True)

            # Save update options
            try:
                f = open(filename, "w")
                json.dump(defaults_from_file, f)
                f.close()
            except:
                self.inform.emit("[error_notcl] Failed to write defaults to file.")
                return
        self.inform.emit("[success]Exported Defaults to %s" % filename)

    def on_preferences_open_folder(self):
        if sys.platform == 'win32':
            subprocess.Popen('explorer %s' % self.data_path)
        elif sys.platform == 'darwin':
            os.system('open "%s"' % self.data_path)
        else:
            subprocess.Popen(['xdg-open', self.data_path])
        self.inform.emit("[success]FlatCAM Preferences Folder opened.")

    def save_geometry(self, x, y, width, height, notebook_width):
        self.defaults["global_def_win_x"] = x
        self.defaults["global_def_win_y"] = y
        self.defaults["global_def_win_w"] = width
        self.defaults["global_def_win_h"] = height
        self.defaults["def_notebook_width"] = notebook_width
        self.save_defaults()

    def message_dialog(self, title, message, kind="info"):
        icon = {"info": QtWidgets.QMessageBox.Information,
                "warning": QtWidgets.QMessageBox.Warning,
                "error": QtWidgets.QMessageBox.Critical}[str(kind)]
        dlg = QtWidgets.QMessageBox(icon, title, message, parent=self.ui)
        dlg.setText(message)
        dlg.exec_()

    def register_recent(self, kind, filename):

        self.log.debug("register_recent()")
        self.log.debug("   %s" % kind)
        self.log.debug("   %s" % filename)

        record = {'kind': str(kind), 'filename': str(filename)}
        if record in self.recent:
            return

        self.recent.insert(0, record)

        if len(self.recent) > self.defaults['global_recent_limit']:  # Limit reached
            self.recent.pop()

        try:
            f = open(self.data_path + '/recent.json', 'w')
        except IOError:
            App.log.error("Failed to open recent items file for writing.")
            self.inform.emit('[error_notcl]Failed to open recent files file for writing.')
            return

        #try:
        json.dump(self.recent, f)
        # except:
        #     App.log.error("Failed to write to recent items file.")
        #     self.inform.emit('ERROR: Failed to write to recent items file.')
        #     f.close()

        f.close()

        # Re-buid the recent items menu
        self.setup_recent_items()

    def new_object(self, kind, name, initialize, active=True, fit=True, plot=True, autoselected=True):
        """
        Creates a new specalized FlatCAMObj and attaches it to the application,
        this is, updates the GUI accordingly, any other records and plots it.
        This method is thread-safe.

        Notes:
            * If the name is in use, the self.collection will modify it
              when appending it to the collection. There is no need to handle
              name conflicts here.

        :param kind: The kind of object to create. One of 'gerber',
         'excellon', 'cncjob' and 'geometry'.
        :type kind: str
        :param name: Name for the object.
        :type name: str
        :param initialize: Function to run after creation of the object
         but before it is attached to the application. The function is
         called with 2 parameters: the new object and the App instance.
        :type initialize: function
        :return: None
        :rtype: None
        """

        App.log.debug("new_object()")
        self.plot = plot
        self.autoselected = autoselected
        t0 = time.time()  # Debug

        ## Create object
        classdict = {
            "gerber": FlatCAMGerber,
            "excellon": FlatCAMExcellon,
            "cncjob": FlatCAMCNCjob,
            "geometry": FlatCAMGeometry
        }

        App.log.debug("Calling object constructor...")
        obj = classdict[kind](name)
        obj.units = self.options["units"]  # TODO: The constructor should look at defaults.

        # Set options from "Project options" form
        self.options_read_form()

        # IMPORTANT
        # The key names in defaults and options dictionary's are not random:
        # they have to have in name first the type of the object (geometry, excellon, cncjob and gerber) or how it's
        # called here, the 'kind' followed by an underline. The function called above (self.options_read_form()) copy
        # the options from project options form into the self.options. After that, below, depending on the type of
        # object that is created, it will strip the name of the object and the underline (if the original key was
        # let's say "excellon_toolchange", it will strip the excellon_) and to the obj.options the key will become
        # "toolchange"
        for option in self.options:
            if option.find(kind + "_") == 0:
                oname = option[len(kind) + 1:]
                obj.options[oname] = self.options[option]

        # if kind == 'geometry':
        #     obj.tools = {}
        # elif kind == 'cncjob':
        #     obj.cnc_tools = {}

        # Initialize as per user request
        # User must take care to implement initialize
        # in a thread-safe way as is is likely that we
        # have been invoked in a separate thread.
        t1 = time.time()
        self.log.debug("%f seconds before initialize()." % (t1 - t0))
        try:
            return_value = initialize(obj, self)
        except Exception as e:
            if str(e) == "Empty Geometry":
                self.inform.emit("[error_notcl] Object (%s) failed because: %s" % (kind, str(e)))
            else:
                self.inform.emit("[error] Object (%s) failed because: %s" % (kind, str(e)))
            return "fail"

        t2 = time.time()
        self.log.debug("%f seconds executing initialize()." % (t2 - t1))

        if return_value == 'fail':
            log.debug("Object (%s) parsing and/or geometry creation failed." % kind)
            return "fail"

        # Check units and convert if necessary
        # This condition CAN be true because initialize() can change obj.units
        if self.options["units"].upper() != obj.units.upper():
            self.inform.emit("Converting units to " + self.options["units"] + ".")
            obj.convert_units(self.options["units"])
            t3 = time.time()
            self.log.debug("%f seconds converting units." % (t3 - t2))

        # Create the bounding box for the object and then add the results to the obj.options
        try:
            xmin, ymin, xmax, ymax = obj.bounds()
            obj.options['xmin'] = xmin
            obj.options['ymin'] = ymin
            obj.options['xmax'] = xmax
            obj.options['ymax'] = ymax
        except:
            log.warning("The object has no bounds properties.")
            pass

        FlatCAMApp.App.log.debug("Moving new object back to main thread.")

        # Move the object to the main thread and let the app know that it is available.
        obj.moveToThread(QtWidgets.QApplication.instance().thread())
        self.object_created.emit(obj, self.plot, self.autoselected)

        return obj

    def new_excellon_object(self):
        self.new_object('excellon', 'new_e', lambda x, y: None)

    def on_object_created(self, obj, plot, autoselect):
        """
        Event callback for object creation.

        :param obj: The newly created FlatCAM object.
        :return: None
        """
        t0 = time.time()  # DEBUG
        self.log.debug("on_object_created()")

        # The Collection might change the name if there is a collision
        self.collection.append(obj)

        # after adding the object to the collection always update the list of objects that are in the collection
        self.all_objects_list = self.collection.get_list()

        self.inform.emit("[success]Object (%s) created: %s" % (obj.kind, obj.options['name']))
        self.new_object_available.emit(obj)

        # update the SHELL auto-completer model with the name of the new object
        self.myKeywords.append(obj.options['name'])
        self.shell._edit.set_model_data(self.myKeywords)

        if autoselect:
            # select the just opened object but deselect the previous ones
            self.collection.set_all_inactive()
            self.collection.set_active(obj.options["name"])

        def worker_task(obj):
            with self.proc_container.new("Plotting"):
                obj.plot()
                t1 = time.time()  # DEBUG
                self.log.debug("%f seconds adding object and plotting." % (t1 - t0))
                self.object_plotted.emit(obj)

        # Send to worker
        # self.worker.add_task(worker_task, [self])
        if plot:
            self.worker_task.emit({'fcn': worker_task, 'params': [obj]})

    def on_object_changed(self, obj):
        # update the bounding box data from obj.options
        xmin, ymin, xmax, ymax = obj.bounds()
        obj.options['xmin'] = xmin
        obj.options['ymin'] = ymin
        obj.options['xmax'] = xmax
        obj.options['ymax'] = ymax

        log.debug("Object changed, updating the bounding box data on self.options")
        # delete the old selection shape
        self.delete_selection_shape()

    def on_object_plotted(self, obj):
        self.on_zoom_fit(None)

    def options_read_form(self):
        for option in self.options_form_fields:
            self.options[option] = self.options_form_fields[option].get_value()

    def options_write_form(self):
        for option in self.options:
            self.options_write_form_field(option)

    def options_write_form_field(self, field):
        try:
            self.options_form_fields[field].set_value(self.options[field])
        except KeyError:
            # Changed from error to debug. This allows to have data stored
            # which is not user-editable.
            # self.log.debug("options_write_form_field(): No field for: %s" % field)
            pass

    def on_about(self):
        """
        Displays the "about" dialog.

        :return: None
        """
        self.report_usage("on_about")

        version = self.version
        version_date = self.version_date
        beta = self.beta

        class AboutDialog(QtWidgets.QDialog):
            def __init__(self, parent=None):
                QtWidgets.QDialog.__init__(self, parent)

                # Icon and title
                self.setWindowIcon(parent.app_icon)
                self.setWindowTitle("FlatCAM")

                layout1 = QtWidgets.QVBoxLayout()
                self.setLayout(layout1)

                layout2 = QtWidgets.QHBoxLayout()
                layout1.addLayout(layout2)

                logo = QtWidgets.QLabel()
                logo.setPixmap(QtGui.QPixmap('share/flatcam_icon256.png'))
                layout2.addWidget(logo, stretch=0)

                title = QtWidgets.QLabel(
                    "<font size=8><B>FlatCAM</B></font><BR>"
                    "Version %s %s (%s) - %s <BR>"
                    "<BR>"
                    "2D Computer-Aided Printed Circuit Board<BR>"
                    "Manufacturing.<BR>"
                    "<BR>"
                    "(c) 2014-2019 <B>Juan Pablo Caram</B><BR>"
                    "<BR>"
                    "<B> Main Contributors:</B><BR>"
                    "Denis Hayrullin<BR>"
                    "Kamil Sopko<BR>"
                    "Marius Stanciu<BR>"
                    "Matthieu Berthomé<BR>"
                    "and many others found "
                    "<a href = \"https://bitbucket.org/jpcgt/flatcam/pull-requests/?state=MERGED\">here.</a><BR>"
                    "<BR>"
                    "Development is done "
                    "<a href = \"https://bitbucket.org/jpcgt/flatcam/src/Beta/\">here.</a><BR>"
                    "DOWNLOAD area "
                    "<a href = \"https://bitbucket.org/jpcgt/flatcam/downloads/\">here.</a><BR>"
                    "" % (version, ('BETA' if beta else ''), version_date, platform.architecture()[0])
                )
                title.setOpenExternalLinks(True)

                layout2.addWidget(title, stretch=1)

                layout3 = QtWidgets.QHBoxLayout()
                layout1.addLayout(layout3)
                layout3.addStretch()
                okbtn = QtWidgets.QPushButton("Close")
                layout3.addWidget(okbtn)

                okbtn.clicked.connect(self.accept)

        AboutDialog(self.ui).exec_()

    def on_file_savedefaults(self):
        """
        Callback for menu item File->Save Defaults. Saves application default options
        ``self.defaults`` to current_defaults.FlatConfig.

        :return: None
        """

        self.save_defaults()

    def on_app_exit(self):
        if self.collection.get_list():
            msgbox = QtWidgets.QMessageBox()
            # msgbox.setText("<B>Save changes ...</B>")
            msgbox.setText("There are files/objects opened in FlatCAM. "
                           "\n"
                           "Do you want to Save the project?")
            msgbox.setWindowTitle("Save changes")
            msgbox.setWindowIcon(QtGui.QIcon('share/save_as.png'))
            msgbox.setStandardButtons(QtWidgets.QMessageBox.Yes | QtWidgets.QMessageBox.No |
                                      QtWidgets.QMessageBox.Cancel)
            msgbox.setDefaultButton(QtWidgets.QMessageBox.Yes)

            response = msgbox.exec_()

            if response == QtWidgets.QMessageBox.Yes:
                self.on_file_saveprojectas(thread=False)
            elif response == QtWidgets.QMessageBox.Cancel:
                return
            self.save_defaults()
        else:
            self.save_defaults()
        log.debug("Application defaults saved ... Exit event.")
        QtWidgets.qApp.quit()

    def save_defaults(self, silent=False):
        """
        Saves application default options
        ``self.defaults`` to current_defaults.FlatConfig.

        :return: None
        """
        self.report_usage("save_defaults")

        # Read options from file
        try:
            f = open(self.data_path + "/current_defaults.FlatConfig")
            defaults_file_content = f.read()
            f.close()
        except:
            e = sys.exc_info()[0]
            App.log.error("Could not load defaults file.")
            App.log.error(str(e))
            self.inform.emit("[error_notcl] Could not load defaults file.")
            return

        try:
            defaults = json.loads(defaults_file_content)
        except:
            e = sys.exc_info()[0]
            App.log.error("Failed to parse defaults file.")
            App.log.error(str(e))
            self.inform.emit("[error_notcl] Failed to parse defaults file.")
            return

        # Update options
        self.defaults_read_form()
        defaults.update(self.defaults)
        self.propagate_defaults(silent=True)

        # Save update options
        try:
            f = open(self.data_path + "/current_defaults.FlatConfig", "w")
            json.dump(defaults, f)
            f.close()
        except:
            self.inform.emit("[error_notcl] Failed to write defaults to file.")
            return

        # Save the toolbar view
        tb_status = 0
        if self.ui.toolbarfile.isVisible():
            tb_status += 1

        if self.ui.toolbargeo.isVisible():
            tb_status += 2

        if self.ui.toolbarview.isVisible():
            tb_status += 4

        if self.ui.toolbartools.isVisible():
            tb_status += 8

        if self.ui.snap_toolbar.isVisible():
            tb_status += 16

        self.defaults["global_toolbar_view"] = tb_status

        if not silent:
            self.inform.emit("[success]Defaults saved.")

    def save_factory_defaults(self, silent=False):
        """
                Saves application factory default options
                ``self.defaults`` to factory_defaults.FlatConfig.
                It's a one time job done just after the first install.

                :return: None
                """
        self.report_usage("save_factory_defaults")

        # Read options from file
        try:
            f_f_def = open(self.data_path + "/factory_defaults.FlatConfig")
            factory_defaults_file_content = f_f_def.read()
            f_f_def.close()
        except:
            e = sys.exc_info()[0]
            App.log.error("Could not load factory defaults file.")
            App.log.error(str(e))
            self.inform.emit("[error_notcl] Could not load factory defaults file.")
            return

        try:
            factory_defaults = json.loads(factory_defaults_file_content)
        except:
            e = sys.exc_info()[0]
            App.log.error("Failed to parse factory defaults file.")
            App.log.error(str(e))
            self.inform.emit("[error_notcl] Failed to parse factory defaults file.")
            return

        # Update options
        self.defaults_read_form()
        factory_defaults.update(self.defaults)
        self.propagate_defaults(silent=True)

        # Save update options
        try:
            f_f_def_s = open(self.data_path + "/factory_defaults.FlatConfig", "w")
            json.dump(factory_defaults, f_f_def_s)
            f_f_def_s.close()
        except:
            self.inform.emit("[error_notcl] Failed to write factory defaults to file.")
            return

        if silent is False:
            self.inform.emit("Factory defaults saved.")

    def final_save(self):
        if self.collection.get_list():
            msgbox = QtWidgets.QMessageBox()
            # msgbox.setText("<B>Save changes ...</B>")
            msgbox.setText("There are files/objects opened in FlatCAM. "
                           "\n"
                           "Do you want to Save the project?")
            msgbox.setWindowTitle("Save changes")
            msgbox.setWindowIcon(QtGui.QIcon('share/save_as.png'))
            msgbox.setStandardButtons(QtWidgets.QMessageBox.Yes | QtWidgets.QMessageBox.No |
                                      QtWidgets.QMessageBox.Cancel)
            msgbox.setDefaultButton(QtWidgets.QMessageBox.Yes)

            response = msgbox.exec_()

            if response == QtWidgets.QMessageBox.Yes:
                self.on_file_saveprojectas(thread=False)
            elif response == QtWidgets.QMessageBox.Cancel:
                self.should_we_quit = False
                return
        self.save_defaults()
        log.debug("Application defaults saved ... Exit event.")

    def on_toggle_shell(self):
        """
        toggle shell if is  visible close it if  closed open it
        :return:
        """

        if self.ui.shell_dock.isVisible():
            self.ui.shell_dock.hide()
        else:
            self.ui.shell_dock.show()

    def on_edit_join(self, name=None):
        """
        Callback for Edit->Join. Joins the selected geometry objects into
        a new one.

        :return: None
        """

        obj_name_single = str(name) if name else "Combo_SingleGeo"
        obj_name_multi = str(name) if name else "Combo_MultiGeo"

        tooldias = []
        geo_type_list = []

        objs = self.collection.get_selected()
        for obj in objs:
            geo_type_list.append(obj.multigeo)

        # if len(set(geo_type_list)) == 1 means that all list elements are the same
        if len(set(geo_type_list)) != 1:
            self.inform.emit("[error] Failed join. The Geometry objects are of different types.\n"
                             "At least one is MultiGeo type and the other is SingleGeo type. A possibility is to "
                             "convert from one to another and retry joining \n"
                             "but in the case of converting from MultiGeo to SingleGeo, informations may be lost and "
                             "the result may not be what was expected. \n"
                             "Check the generated GCODE.")
            return

        # if at least one True object is in the list then due of the previous check, all list elements are True objects
        if True in geo_type_list:
            def initialize(obj, app):
                FlatCAMGeometry.merge(objs, obj, multigeo=True)

                # rename all the ['name] key in obj.tools[tooluid]['data'] to the obj_name_multi
                for v in obj.tools.values():
                    v['data']['name'] = obj_name_multi
            self.new_object("geometry", obj_name_multi, initialize)
        else:
            def initialize(obj, app):
                FlatCAMGeometry.merge(objs, obj, multigeo=False)

                # rename all the ['name] key in obj.tools[tooluid]['data'] to the obj_name_multi
                for v in obj.tools.values():
                    v['data']['name'] = obj_name_single
            self.new_object("geometry", obj_name_single, initialize)

    def on_edit_join_exc(self):
        """
        Callback for Edit->Join Excellon. Joins the selected excellon objects into
        a new one.

        :return: None
        """
        objs = self.collection.get_selected()

        for obj in objs:
            if not isinstance(obj, FlatCAMExcellon):
                self.inform.emit("[error_notcl]Failed. Excellon joining works only on Excellon objects.")
                return

        def initialize(obj, app):
            FlatCAMExcellon.merge(objs, obj)

        self.new_object("excellon", 'Combo_Excellon', initialize)

    def on_edit_join_grb(self):
        """
                Callback for Edit->Join Gerber. Joins the selected Gerber objects into
                a new one.

                :return: None
                """
        objs = self.collection.get_selected()

        for obj in objs:
            if not isinstance(obj, FlatCAMGerber):
                self.inform.emit("[error_notcl]Failed. Gerber joining works only on Gerber objects.")
                return

        def initialize(obj, app):
            FlatCAMGerber.merge(objs, obj)

        self.new_object("gerber", 'Combo_Gerber', initialize)

    def on_convert_singlegeo_to_multigeo(self):
        obj = self.collection.get_active()

        if obj is None:
            self.inform.emit("[error_notcl]Failed. Select a Geometry Object and try again.")
            return

        if not isinstance(obj, FlatCAMGeometry):
            self.inform.emit("[error_notcl]Expected a FlatCAMGeometry, got %s" % type(obj))
            return

        obj.multigeo = True
        for tooluid, dict_value in obj.tools.items():
            dict_value['solid_geometry'] = deepcopy(obj.solid_geometry)
        if not isinstance(obj.solid_geometry, list):
            obj.solid_geometry = [obj.solid_geometry]
        obj.solid_geometry[:] = []
        obj.plot()

        self.inform.emit("[success] A Geometry object was converted to MultiGeo type.")

    def on_convert_multigeo_to_singlegeo(self):
        obj = self.collection.get_active()

        if obj is None:
            self.inform.emit("[error_notcl]Failed. Select a Geometry Object and try again.")
            return

        if not isinstance(obj, FlatCAMGeometry):
            self.inform.emit("[error_notcl]Expected a FlatCAMGeometry, got %s" % type(obj))
            return

        obj.multigeo = False
        total_solid_geometry = []
        for tooluid, dict_value in obj.tools.items():
            total_solid_geometry += deepcopy(dict_value['solid_geometry'])
            # clear the original geometry
            dict_value['solid_geometry'][:] = []
        obj.solid_geometry = deepcopy(total_solid_geometry)
        obj.plot()

        self.inform.emit("[success] A Geometry object was converted to SingleGeo type.")

    def on_options_dict_change(self, field):
        self.options_write_form_field(field)

        if field == "units":
            self.set_screen_units(self.options['units'])

    def on_defaults_dict_change(self, field):
        self.defaults_write_form_field(field)

    def set_screen_units(self, units):
        self.ui.units_label.setText("[" + self.options["units"].lower() + "]")

    def on_toggle_units(self):
        """
        Callback for the Units radio-button change in the Options tab.
        Changes the application's default units or the current project's units.
        If changing the project's units, the change propagates to all of
        the objects in the project.

        :return: None
        """

        self.report_usage("on_toggle_units")

        if self.toggle_units_ignore:
            return

        # If option is the same, then ignore
        if self.general_options_form.general_app_group.units_radio.get_value().upper() == self.options["units"].upper():
            self.log.debug("on_toggle_units(): Same as options, so ignoring.")
            return

        # Options to scale
        dimensions = ['gerber_isotooldia', 'tools_cutoutmargin', 'tools_cutoutgapsize',
                      'gerber_noncoppermargin', 'gerber_bboxmargin','gerber_isooverlap','tools_nccoverlap',
                      'tools_nccmargin','tools_cutouttooldia','tools_cutoutgapsize',
                      'gerber_noncoppermargin','gerber_bboxmargin',
                      'excellon_drillz', "excellon_toolchangexy",
                      'excellon_travelz', 'excellon_feedrate', 'excellon_feedrate_rapid', 'excellon_toolchangez',
                      'excellon_tooldia', 'excellon_endz', 'cncjob_tooldia',
                      'geometry_cutz', 'geometry_travelz', 'geometry_feedrate', 'geometry_feedrate_rapid',
                      'geometry_cnctooldia', 'geometry_painttooldia', 'geometry_paintoverlap', 'geometry_toolchangexy',
                      'geometry_toolchangez',
                      'geometry_paintmargin', 'geometry_endz', 'geometry_depthperpass', 'global_gridx', 'global_gridy']

        def scale_options(sfactor):
            for dim in dimensions:
                if dim == 'excellon_toolchangexy':
                    coords_xy = [float(eval(a)) for a in self.defaults["excellon_toolchangexy"].split(",")]
                    coords_xy[0] *= sfactor
                    coords_xy[1] *= sfactor
                    self.options['excellon_toolchangexy'] = "%f, %f" % (coords_xy[0], coords_xy[1])
                elif dim == 'geometry_toolchangexy':
                    coords_xy = [float(eval(a)) for a in self.defaults["geometry_toolchangexy"].split(",")]
                    coords_xy[0] *= sfactor
                    coords_xy[1] *= sfactor
                    self.options['geometry_toolchangexy'] = "%f, %f" % (coords_xy[0], coords_xy[1])
                else:
                    self.options[dim] *= sfactor

        # The scaling factor depending on choice of units.
        factor = 1/25.4
        if self.general_options_form.general_app_group.units_radio.get_value().upper() == 'MM':
            factor = 25.4


        # Changing project units. Warn user.
        msgbox = QtWidgets.QMessageBox()
        msgbox.setText("<B>Change project units ...</B>")
        msgbox.setInformativeText("Changing the units of the project causes all geometrical "
                                  "properties of all objects to be scaled accordingly. Continue?")
        msgbox.setStandardButtons(QtWidgets.QMessageBox.Cancel | QtWidgets.QMessageBox.Ok)
        msgbox.setDefaultButton(QtWidgets.QMessageBox.Ok)

        response = msgbox.exec_()

        if response == QtWidgets.QMessageBox.Ok:
            self.options_read_form()
            scale_options(factor)
            self.options_write_form()

            # change this only if the workspace is active
            if self.defaults['global_workspace'] is True:
                self.plotcanvas.draw_workspace()

            # adjust the grid values on the main toolbar
            self.ui.grid_gap_x_entry.set_value(float(self.ui.grid_gap_x_entry.get_value()) * factor)
            self.ui.grid_gap_y_entry.set_value(float(self.ui.grid_gap_y_entry.get_value()) * factor)

            for obj in self.collection.get_list():
                units = self.general_options_form.general_app_group.units_radio.get_value().upper()
                obj.convert_units(units)

                # make that the properties stored in the object are also updated
                self.object_changed.emit(obj)
                obj.build_ui()

            current = self.collection.get_active()
            if current is not None:
                # the transfer of converted values to the UI form for Geometry is done local in the FlatCAMObj.py
                if not isinstance(current, FlatCAMGeometry):
                    current.to_form()

            self.plot_all()
        else:
            # Undo toggling
            self.toggle_units_ignore = True
            if self.general_options_form.general_app_group.units_radio.get_value().upper() == 'MM':
                self.general_options_form.general_app_group.units_radio.set_value('IN')
            else:
                self.general_options_form.general_app_group.units_radio.set_value('MM')
            self.toggle_units_ignore = False

        self.options_read_form()
        self.inform.emit("Converted units to %s" % self.options["units"])
        #self.ui.units_label.setText("[" + self.options["units"] + "]")
        self.set_screen_units(self.options["units"])

    def on_toggle_units_click(self):
        if self.options["units"] == 'MM':
            self.general_options_form.general_app_group.units_radio.set_value("IN")
        else:
            self.general_options_form.general_app_group.units_radio.set_value("MM")
        self.on_toggle_units()

    def on_language_apply(self):
        # TODO: apply the language
        # app restart section
        pass

    def on_toggle_axis(self):
        if self.toggle_axis is False:
            self.plotcanvas.v_line.set_data(color=(0.70, 0.3, 0.3, 1.0))
            self.plotcanvas.h_line.set_data(color=(0.70, 0.3, 0.3, 1.0))
            self.plotcanvas.redraw()
            self.toggle_axis = True
        else:
            self.plotcanvas.v_line.set_data(color=(0.0, 0.0, 0.0, 0.0))

            self.plotcanvas.h_line.set_data(color=(0.0, 0.0, 0.0, 0.0))
            self.plotcanvas.redraw()
            self.toggle_axis = False

    def on_toggle_grid(self):
        self.ui.grid_snap_btn.trigger()

    def on_options_combo_change(self, sel):
        """
        Called when the combo box to choose between application defaults and
        project option changes value. The corresponding variables are
        copied to the UI.

        :param sel: The option index that was chosen.
        :return: None
        """

        # combo_sel = self.ui.notebook.combo_options.get_active()
        App.log.debug("Options --> %s" % sel)

        # form = [self.defaults_form, self.options_form][sel]
        # self.ui.notebook.options_contents.pack_start(form, False, False, 1)

        if sel == 0:
            self.gen_form = self.general_defaults_form
            self.ger_form = self.gerber_defaults_form
            self.exc_form = self.excellon_defaults_form
            self.geo_form = self.geometry_defaults_form
            self.cnc_form = self.cncjob_defaults_form
            self.tools_form = self.tools_defaults_form
        elif sel == 1:
            self.gen_form = self.general_options_form
            self.ger_form = self.gerber_options_form
            self.exc_form = self.excellon_options_form
            self.geo_form = self.geometry_options_form
            self.cnc_form = self.cncjob_options_form
            self.tools_form = self.tools_options_form
        else:
            return

        try:
            self.ui.general_scroll_area.takeWidget()
        except:
            self.log.debug("Nothing to remove")
        self.ui.general_scroll_area.setWidget(self.gen_form)
        self.gen_form.show()

        try:
            self.ui.gerber_scroll_area.takeWidget()
        except:
            self.log.debug("Nothing to remove")
        self.ui.gerber_scroll_area.setWidget(self.ger_form)
        self.ger_form.show()

        try:
            self.ui.excellon_scroll_area.takeWidget()
        except:
            self.log.debug("Nothing to remove")
        self.ui.excellon_scroll_area.setWidget(self.exc_form)
        self.exc_form.show()

        try:
            self.ui.geometry_scroll_area.takeWidget()
        except:
            self.log.debug("Nothing to remove")
        self.ui.geometry_scroll_area.setWidget(self.geo_form)
        self.geo_form.show()

        try:
            self.ui.cncjob_scroll_area.takeWidget()
        except:
            self.log.debug("Nothing to remove")
        self.ui.cncjob_scroll_area.setWidget(self.cnc_form)
        self.cnc_form.show()

        try:
            self.ui.tools_scroll_area.takeWidget()
        except:
            self.log.debug("Nothing to remove")
        self.ui.tools_scroll_area.setWidget(self.tools_form)
        self.tools_form.show()

        self.log.debug("Finished GUI form initialization.")

        # self.options2form()

    def on_excellon_defaults_button(self):
        self.defaults_form_fields["excellon_format_lower_in"].set_value('4')
        self.defaults_form_fields["excellon_format_upper_in"].set_value('2')
        self.defaults_form_fields["excellon_format_lower_mm"].set_value('3')
        self.defaults_form_fields["excellon_format_upper_mm"].set_value('3')
        self.defaults_form_fields["excellon_zeros"].set_value('L')
        self.defaults_form_fields["excellon_units"].set_value('INCH')
        log.debug("Excellon app defaults loaded ...")

    def on_excellon_options_button(self):

        self.options_form_fields["excellon_format_lower_in"].set_value('4')
        self.options_form_fields["excellon_format_upper_in"].set_value('2')
        self.options_form_fields["excellon_format_lower_mm"].set_value('3')
        self.options_form_fields["excellon_format_upper_mm"].set_value('3')
        self.options_form_fields["excellon_zeros"].set_value('L')
        self.options_form_fields["excellon_units"].set_value('INCH')
        log.debug("Excellon options defaults loaded ...")

    # Setting plot colors handlers
    def on_pf_color_entry(self):
        self.defaults['global_plot_fill'] = self.general_defaults_form.general_gui_group.pf_color_entry.get_value()[:7] + \
                                            self.defaults['global_plot_fill'][7:9]
        self.general_defaults_form.general_gui_group.pf_color_button.setStyleSheet(
            "background-color:%s" % str(self.defaults['global_plot_fill'])[:7])

    def on_pf_color_button(self):
        current_color = QtGui.QColor(self.defaults['global_plot_fill'][:7])

        c_dialog = QtWidgets.QColorDialog()
        plot_fill_color = c_dialog.getColor(initial=current_color)

        if plot_fill_color.isValid() is False:
            return

        self.general_defaults_form.general_gui_group.pf_color_button.setStyleSheet(
            "background-color:%s" % str(plot_fill_color.name()))

        new_val = str(plot_fill_color.name()) + str(self.defaults['global_plot_fill'][7:9])
        self.general_defaults_form.general_gui_group.pf_color_entry.set_value(new_val)
        self.defaults['global_plot_fill'] = new_val

    def on_pf_color_spinner(self):
        spinner_value = self.general_defaults_form.general_gui_group.pf_color_alpha_spinner.value()
        self.general_defaults_form.general_gui_group.pf_color_alpha_slider.setValue(spinner_value)
        self.defaults['global_plot_fill'] = self.defaults['global_plot_fill'][:7] + \
                                            (hex(spinner_value)[2:] if int(hex(spinner_value)[2:], 16) > 0 else '00')
        self.defaults['global_plot_line'] = self.defaults['global_plot_line'][:7] + \
                                            (hex(spinner_value)[2:] if int(hex(spinner_value)[2:], 16) > 0 else '00')

    def on_pf_color_slider(self):
        slider_value = self.general_defaults_form.general_gui_group.pf_color_alpha_slider.value()
        self.general_defaults_form.general_gui_group.pf_color_alpha_spinner.setValue(slider_value)

    def on_pl_color_entry(self):
        self.defaults['global_plot_line'] = self.general_defaults_form.general_gui_group.pl_color_entry.get_value()[:7] + \
                                            self.defaults['global_plot_line'][7:9]
        self.general_defaults_form.general_gui_group.pl_color_button.setStyleSheet(
            "background-color:%s" % str(self.defaults['global_plot_line'])[:7])

    def on_pl_color_button(self):
        current_color = QtGui.QColor(self.defaults['global_plot_line'][:7])
        # print(current_color)

        c_dialog = QtWidgets.QColorDialog()
        plot_line_color = c_dialog.getColor(initial=current_color)

        if plot_line_color.isValid() is False:
            return

        self.general_defaults_form.general_gui_group.pl_color_button.setStyleSheet(
            "background-color:%s" % str(plot_line_color.name()))

        new_val_line = str(plot_line_color.name()) + str(self.defaults['global_plot_line'][7:9])
        self.general_defaults_form.general_gui_group.pl_color_entry.set_value(new_val_line)
        self.defaults['global_plot_line'] = new_val_line

    # Setting selection colors (left - right) handlers
    def on_sf_color_entry(self):
        self.defaults['global_sel_fill'] = self.general_defaults_form.general_gui_group.sf_color_entry.get_value()[:7] + \
                                            self.defaults['global_sel_fill'][7:9]
        self.general_defaults_form.general_gui_group.sf_color_button.setStyleSheet(
            "background-color:%s" % str(self.defaults['global_sel_fill'])[:7])

    def on_sf_color_button(self):
        current_color = QtGui.QColor(self.defaults['global_sel_fill'][:7])

        c_dialog = QtWidgets.QColorDialog()
        plot_fill_color = c_dialog.getColor(initial=current_color)

        if plot_fill_color.isValid() is False:
            return

        self.general_defaults_form.general_gui_group.sf_color_button.setStyleSheet(
            "background-color:%s" % str(plot_fill_color.name()))

        new_val = str(plot_fill_color.name()) + str(self.defaults['global_sel_fill'][7:9])
        self.general_defaults_form.general_gui_group.sf_color_entry.set_value(new_val)
        self.defaults['global_sel_fill'] = new_val

    def on_sf_color_spinner(self):
        spinner_value = self.general_defaults_form.general_gui_group.sf_color_alpha_spinner.value()
        self.general_defaults_form.general_gui_group.sf_color_alpha_slider.setValue(spinner_value)
        self.defaults['global_sel_fill'] = self.defaults['global_sel_fill'][:7] + \
                                            (hex(spinner_value)[2:] if int(hex(spinner_value)[2:], 16) > 0 else '00')
        self.defaults['global_sel_line'] = self.defaults['global_sel_line'][:7] + \
                                            (hex(spinner_value)[2:] if int(hex(spinner_value)[2:], 16) > 0 else '00')

    def on_sf_color_slider(self):
        slider_value = self.general_defaults_form.general_gui_group.sf_color_alpha_slider.value()
        self.general_defaults_form.general_gui_group.sf_color_alpha_spinner.setValue(slider_value)

    def on_sl_color_entry(self):
        self.defaults['global_sel_line'] = self.general_defaults_form.general_gui_group.sl_color_entry.get_value()[:7] + \
                                            self.defaults['global_sel_line'][7:9]
        self.general_defaults_form.general_gui_group.sl_color_button.setStyleSheet(
            "background-color:%s" % str(self.defaults['global_sel_line'])[:7])

    def on_sl_color_button(self):
        current_color = QtGui.QColor(self.defaults['global_sel_line'][:7])

        c_dialog = QtWidgets.QColorDialog()
        plot_line_color = c_dialog.getColor(initial=current_color)

        if plot_line_color.isValid() is False:
            return

        self.general_defaults_form.general_gui_group.sl_color_button.setStyleSheet(
            "background-color:%s" % str(plot_line_color.name()))

        new_val_line = str(plot_line_color.name()) + str(self.defaults['global_sel_line'][7:9])
        self.general_defaults_form.general_gui_group.sl_color_entry.set_value(new_val_line)
        self.defaults['global_sel_line'] = new_val_line

    # Setting selection colors (right - left) handlers
    def on_alt_sf_color_entry(self):
        self.defaults['global_alt_sel_fill'] = self.general_defaults_form.general_gui_group \
                                   .alt_sf_color_entry.get_value()[:7] + self.defaults['global_alt_sel_fill'][7:9]
        self.general_defaults_form.general_gui_group.alt_sf_color_button.setStyleSheet(
            "background-color:%s" % str(self.defaults['global_alt_sel_fill'])[:7])

    def on_alt_sf_color_button(self):
        current_color = QtGui.QColor(self.defaults['global_alt_sel_fill'][:7])

        c_dialog = QtWidgets.QColorDialog()
        plot_fill_color = c_dialog.getColor(initial=current_color)

        if plot_fill_color.isValid() is False:
            return

        self.general_defaults_form.general_gui_group.alt_sf_color_button.setStyleSheet(
            "background-color:%s" % str(plot_fill_color.name()))

        new_val = str(plot_fill_color.name()) + str(self.defaults['global_alt_sel_fill'][7:9])
        self.general_defaults_form.general_gui_group.alt_sf_color_entry.set_value(new_val)
        self.defaults['global_alt_sel_fill'] = new_val

    def on_alt_sf_color_spinner(self):
        spinner_value = self.general_defaults_form.general_gui_group.alt_sf_color_alpha_spinner.value()
        self.general_defaults_form.general_gui_group.alt_sf_color_alpha_slider.setValue(spinner_value)
        self.defaults['global_alt_sel_fill'] = self.defaults['global_alt_sel_fill'][:7] + \
                                            (hex(spinner_value)[2:] if int(hex(spinner_value)[2:], 16) > 0 else '00')
        self.defaults['global_alt_sel_line'] = self.defaults['global_alt_sel_line'][:7] + \
                                            (hex(spinner_value)[2:] if int(hex(spinner_value)[2:], 16) > 0 else '00')

    def on_alt_sf_color_slider(self):
        slider_value = self.general_defaults_form.general_gui_group.alt_sf_color_alpha_slider.value()
        self.general_defaults_form.general_gui_group.alt_sf_color_alpha_spinner.setValue(slider_value)

    def on_alt_sl_color_entry(self):
        self.defaults['global_alt_sel_line'] = self.general_defaults_form.general_gui_group \
                                   .alt_sl_color_entry.get_value()[:7] + self.defaults['global_alt_sel_line'][7:9]
        self.general_defaults_form.general_gui_group.alt_sl_color_button.setStyleSheet(
            "background-color:%s" % str(self.defaults['global_alt_sel_line'])[:7])

    def on_alt_sl_color_button(self):
        current_color = QtGui.QColor(self.defaults['global_alt_sel_line'][:7])

        c_dialog = QtWidgets.QColorDialog()
        plot_line_color = c_dialog.getColor(initial=current_color)

        if plot_line_color.isValid() is False:
            return

        self.general_defaults_form.general_gui_group.alt_sl_color_button.setStyleSheet(
            "background-color:%s" % str(plot_line_color.name()))

        new_val_line = str(plot_line_color.name()) + str(self.defaults['global_alt_sel_line'][7:9])
        self.general_defaults_form.general_gui_group.alt_sl_color_entry.set_value(new_val_line)
        self.defaults['global_alt_sel_line'] = new_val_line

    # Setting Editor colors
    def on_draw_color_entry(self):
        self.defaults['global_draw_color'] = self.general_defaults_form.general_gui_group \
                                                   .draw_color_entry.get_value()
        self.general_defaults_form.general_gui_group.draw_color_button.setStyleSheet(
            "background-color:%s" % str(self.defaults['global_draw_color']))

    def on_draw_color_button(self):
        current_color = QtGui.QColor(self.defaults['global_draw_color'])

        c_dialog = QtWidgets.QColorDialog()
        draw_color = c_dialog.getColor(initial=current_color)

        if draw_color.isValid() is False:
            return

        self.general_defaults_form.general_gui_group.draw_color_button.setStyleSheet(
            "background-color:%s" % str(draw_color.name()))

        new_val = str(draw_color.name())
        self.general_defaults_form.general_gui_group.draw_color_entry.set_value(new_val)
        self.defaults['global_draw_color'] = new_val

    def on_sel_draw_color_entry(self):
        self.defaults['global_sel_draw_color'] = self.general_defaults_form.general_gui_group \
                                                   .sel_draw_color_entry.get_value()
        self.general_defaults_form.general_gui_group.sel_draw_color_button.setStyleSheet(
            "background-color:%s" % str(self.defaults['global_sel_draw_color']))

    def on_sel_draw_color_button(self):
        current_color = QtGui.QColor(self.defaults['global_sel_draw_color'])

        c_dialog = QtWidgets.QColorDialog()
        sel_draw_color = c_dialog.getColor(initial=current_color)

        if sel_draw_color.isValid() is False:
            return

        self.general_defaults_form.general_gui_group.sel_draw_color_button.setStyleSheet(
            "background-color:%s" % str(sel_draw_color.name()))

        new_val_sel = str(sel_draw_color.name())
        self.general_defaults_form.general_gui_group.sel_draw_color_entry.set_value(new_val_sel)
        self.defaults['global_sel_draw_color'] = new_val_sel

    def on_workspace_modified(self):
        self.save_defaults(silent=True)
        self.plotcanvas.draw_workspace()

    def on_workspace(self):
        if self.general_defaults_form.general_gui_group.workspace_cb.isChecked():
            self.plotcanvas.restore_workspace()
        else:
            self.plotcanvas.delete_workspace()

        self.save_defaults(silent=True)

    def on_workspace_menu(self):
        if self.general_defaults_form.general_gui_group.workspace_cb.isChecked():
            self.general_defaults_form.general_gui_group.workspace_cb.setChecked(False)
        else:
            self.general_defaults_form.general_gui_group.workspace_cb.setChecked(True)
        self.on_workspace()

    def on_save_button(self):
        self.save_defaults(silent=False)
        # load the defaults so they are updated into the app
        self.load_defaults(filename='current_defaults')
        # Re-fresh project options
        self.on_options_app2project()

    def handleOpen(self):
        filter_group = " G-Code Files (*.nc);; G-Code Files (*.txt);; G-Code Files (*.tap);; G-Code Files (*.cnc);; " \
                   "All Files (*.*)"
        path, _ = QtWidgets.QFileDialog.getOpenFileName(
            caption='Open file', directory=self.get_last_folder(), filter=filter_group)
        if path:
            file = QtCore.QFile(path)
            if file.open(QtCore.QIODevice.ReadOnly):
                stream = QtCore.QTextStream(file)
                self.gcode_edited = stream.readAll()
                self.ui.code_editor.setPlainText(self.gcode_edited)
                file.close()

    def handlePrint(self):
        dialog = QtPrintSupport.QPrintDialog()
        if dialog.exec_() == QtWidgets.QDialog.Accepted:
            self.ui.code_editor.document().print_(dialog.printer())

    def handlePreview(self):
        dialog = QtPrintSupport.QPrintPreviewDialog()
        dialog.paintRequested.connect(self.ui.code_editor.print_)
        dialog.exec_()

    def handleTextChanged(self):
        # enable = not self.ui.code_editor.document().isEmpty()
        # self.ui.buttonPrint.setEnabled(enable)
        # self.ui.buttonPreview.setEnabled(enable)
        pass

    def handleSaveGCode(self):
        _filter_ = " G-Code Files (*.nc);; G-Code Files (*.txt);; G-Code Files (*.tap);; G-Code Files (*.cnc);; " \
                   "All Files (*.*)"
        try:
            filename = str(QtWidgets.QFileDialog.getSaveFileName(
                caption="Export G-Code ...", directory=self.defaults["global_last_folder"], filter=_filter_)[0])
        except TypeError:
            filename = str(QtWidgets.QFileDialog.getSaveFileName(caption="Export G-Code ...", filter=_filter_)[0])

        try:
            my_gcode = self.ui.code_editor.toPlainText()
            with open(filename, 'w') as f:
                for line in my_gcode:
                    f.write(line)

        except FileNotFoundError:
            self.inform.emit("[WARNING] No such file or directory")
            return

        # Just for adding it to the recent files list.
        self.file_opened.emit("cncjob", filename)

        self.file_saved.emit("cncjob", filename)
        self.inform.emit("Saved to: " + filename)

    def handleFindGCode(self):
        flags = QtGui.QTextDocument.FindCaseSensitively
        text_to_be_found = self.ui.entryFind.get_value()

        r = self.ui.code_editor.find(str(text_to_be_found), flags)
        if r is False:
            self.ui.code_editor.moveCursor(QtGui.QTextCursor.Start)


    def handleReplaceGCode(self):
        old = self.ui.entryFind.get_value()
        new = self.ui.entryReplace.get_value()

        if self.ui.sel_all_cb.isChecked():
            while True:
                cursor = self.ui.code_editor.textCursor()
                cursor.beginEditBlock()
                flags = QtGui.QTextDocument.FindCaseSensitively
                # self.ui.editor is the QPlainTextEdit
                r = self.ui.code_editor.find(str(old), flags)
                if r:
                    qc = self.ui.code_editor.textCursor()
                    if qc.hasSelection():
                        qc.insertText(new)
                else:
                    self.ui.code_editor.moveCursor(QtGui.QTextCursor.Start)
                    break
            # Mark end of undo block
            cursor.endEditBlock()
        else:
            cursor = self.ui.code_editor.textCursor()
            cursor.beginEditBlock()
            qc = self.ui.code_editor.textCursor()
            if qc.hasSelection():
                qc.insertText(new)
            # Mark end of undo block
            cursor.endEditBlock()


    def on_new_geometry(self):
        def initialize(obj, self):
            obj.multitool = False

        self.new_object('geometry', 'new_g', initialize)
        self.plot_all()

    def on_delete(self):
        """
        Delete the currently selected FlatCAMObjs.

        :return: None
        """

        # Make sure that the deletion will happen only after the Editor is no longer active otherwise we might delete
        # a geometry object before we update it.
        if self.geo_editor.editor_active is False and self.exc_editor.editor_active is False:
            if self.collection.get_active():
                self.log.debug("on_delete()")
                self.report_usage("on_delete")

                while (self.collection.get_active()):
                    self.delete_first_selected()

                self.inform.emit("Object(s) deleted ...")
                # make sure that the selection shape is deleted, too
                self.delete_selection_shape()
            else:
                self.inform.emit("Failed. No object(s) selected...")
        else:
            self.inform.emit("Save the work in Editor and try again ...")

    def on_set_origin(self):
        """
        Set the origin to the left mouse click position

        :return: None
        """

        #display the message for the user
        #and ask him to click on the desired position
        self.inform.emit('Click to set the origin ...')

        self.plotcanvas.vis_connect('mouse_press', self.on_set_zero_click)

    def on_jump_to(self):
        """
        Jump to a location by setting the mouse cursor location
        :return:

        """

        dia_box = Dialog_box(title="Jump to Coordinates", label="Enter the coordinates in format X,Y:")

        if dia_box.ok is True:
            try:
                location = eval(dia_box.location)
                if not isinstance(location, tuple):
                    self.inform.emit("Wrong coordinates. Enter coordinates in format: X,Y")
                    return
            except:
                return
        else:
            return

        self.plotcanvas.fit_center(loc=location)

        cursor = QtGui.QCursor()

        canvas_origin = self.plotcanvas.vispy_canvas.native.mapToGlobal(QtCore.QPoint(0, 0))
        jump_loc = self.plotcanvas.vispy_canvas.translate_coords_2((location[0], location[1]))

        cursor.setPos(canvas_origin.x() + jump_loc[0], (canvas_origin.y() + jump_loc[1]))
        self.inform.emit("Done.")

    def on_copy_object(self):

        def initialize(obj_init, app):
            obj_init.solid_geometry = obj.solid_geometry
            try:
                if obj.tools:
                    obj_init.tools = obj.tools
            except Exception as e:
                log.debug("on_copy_object() --> %s" % str(e))

        def initialize_excellon(obj_init, app):
            obj_init.tools = obj.tools

            # drills are offset, so they need to be deep copied
            obj_init.drills = deepcopy(obj.drills)
            # slots are offset, so they need to be deep copied
            obj_init.slots = deepcopy(obj.slots)
            obj_init.create_geometry()

        for obj in self.collection.get_selected():

            obj_name = obj.options["name"]

            try:
                if isinstance(obj, FlatCAMExcellon):
                    self.new_object("excellon", str(obj_name) + "_copy", initialize_excellon)
                elif isinstance(obj,FlatCAMGerber):
                    self.new_object("gerber", str(obj_name) + "_copy", initialize)
                elif isinstance(obj,FlatCAMGeometry):
                    self.new_object("geometry", str(obj_name) + "_copy", initialize)
            except Exception as e:
                return "Operation failed: %s" % str(e)

    def on_copy_object2(self, custom_name):

        def initialize_geometry(obj_init, app):
            obj_init.solid_geometry = obj.solid_geometry
            try:
                if obj.tools:
                    obj_init.tools = obj.tools
            except Exception as e:
                log.debug("on_copy_object2() --> %s" % str(e))

        def initialize_gerber(obj_init, app):
            obj_init.solid_geometry = obj.solid_geometry
            obj_init.apertures = deepcopy(obj.apertures)
            obj_init.aperture_macros = deepcopy(obj.aperture_macros)

        def initialize_excellon(obj_init, app):
            obj_init.tools = obj.tools
            # drills are offset, so they need to be deep copied
            obj_init.drills = deepcopy(obj.drills)
            # slots are offset, so they need to be deep copied
            obj_init.slots = deepcopy(obj.slots)
            obj_init.create_geometry()

        for obj in self.collection.get_selected():
            obj_name = obj.options["name"]
            try:
                if isinstance(obj, FlatCAMExcellon):
                    self.new_object("excellon", str(obj_name) + custom_name, initialize_excellon)
                elif isinstance(obj,FlatCAMGerber):
                    self.new_object("gerber", str(obj_name) + custom_name, initialize_gerber)
                elif isinstance(obj,FlatCAMGeometry):
                    self.new_object("geometry", str(obj_name) + custom_name, initialize_geometry)
            except Exception as e:
                return "Operation failed: %s" % str(e)

    def on_rename_object(self, text):
        named_obj = self.collection.get_active()
        for obj in named_obj:
            if obj is list:
                self.on_rename_object(text)
            else:
                try:
                    obj.options['name'] = text
                except:
                    log.warning("Could not rename the object in the list")

    def on_copy_object_as_geometry(self):

        def initialize(obj_init, app):
            obj_init.solid_geometry = obj.solid_geometry
            if obj.tools:
                obj_init.tools = obj.tools

        def initialize_excellon(obj, app):
            objs = self.collection.get_selected()
            FlatCAMGeometry.merge(objs, obj)

        for obj in self.collection.get_selected():

            obj_name = obj.options["name"]

            try:
                if isinstance(obj, FlatCAMExcellon):
                    self.new_object("geometry", str(obj_name) + "_gcopy", initialize_excellon)
                else:
                    self.new_object("geometry", str(obj_name) + "_gcopy", initialize)

            except Exception as e:
                return "Operation failed: %s" % str(e)

    def on_set_zero_click(self, event):
        #this function will be available only for mouse left click
        pos =[]
        pos_canvas = self.plotcanvas.vispy_canvas.translate_coords(event.pos)
        if event.button == 1:
            if self.grid_status() == True:
                pos = self.geo_editor.snap(pos_canvas[0], pos_canvas[1])
            else:
                pos = pos_canvas

            x = 0 - pos[0]
            y = 0 - pos[1]
            for obj in self.collection.get_list():
                obj.offset((x,y))
                self.object_changed.emit(obj)
                # obj.plot()
            self.plot_all()
            self.inform.emit('[success] Origin set ...')
            self.plotcanvas.vis_disconnect('mouse_press', self.on_set_zero_click)

    def on_selectall(self):
        # delete the possible selection box around a possible selected object
        self.delete_selection_shape()
        for name in self.collection.get_names():
            self.collection.set_active(name)
            curr_sel_obj = self.collection.get_by_name(name)
            # create the selection box around the selected object
            self.draw_selection_shape(curr_sel_obj)

    def on_preferences(self):

        # add the tab if it was closed
        self.ui.plot_tab_area.addTab(self.ui.preferences_tab, "Preferences")

        # delete the absolute and relative position and messages in the infobar
        self.ui.position_label.setText("")
        self.ui.rel_position_label.setText("")

        # Switch plot_area to preferences page
        self.ui.plot_tab_area.setCurrentWidget(self.ui.preferences_tab)
        self.ui.show()

    def on_flipy(self):
        obj_list = self.collection.get_selected()
        xminlist = []
        yminlist = []
        xmaxlist = []
        ymaxlist = []

        if not obj_list:
            self.inform.emit("[warning_notcl] No object selected.")
            msg = "Please Select an object to flip!"
            warningbox = QtWidgets.QMessageBox()
            warningbox.setText(msg)
            warningbox.setWindowTitle("Warning ...")
            warningbox.setWindowIcon(QtGui.QIcon('share/warning.png'))
            warningbox.setStandardButtons(QtWidgets.QMessageBox.Ok)
            warningbox.setDefaultButton(QtWidgets.QMessageBox.Ok)
            warningbox.exec_()
        else:
            try:
                # first get a bounding box to fit all
                for obj in obj_list:
                    xmin, ymin, xmax, ymax = obj.bounds()
                    xminlist.append(xmin)
                    yminlist.append(ymin)
                    xmaxlist.append(xmax)
                    ymaxlist.append(ymax)

                # get the minimum x,y and maximum x,y for all objects selected
                xminimal = min(xminlist)
                yminimal = min(yminlist)
                xmaximal = max(xmaxlist)
                ymaximal = max(ymaxlist)

                px = 0.5 * (xminimal + xmaximal)
                py = 0.5 * (yminimal + ymaximal)

                # execute mirroring
                for obj in obj_list:
                    obj.mirror('X', [px, py])
                    obj.plot()
                    self.object_changed.emit(obj)
            except Exception as e:
                self.inform.emit("[error_notcl] Due of %s, Flip action was not executed." % str(e))
                return

    def on_flipx(self):
        obj_list = self.collection.get_selected()
        xminlist = []
        yminlist = []
        xmaxlist = []
        ymaxlist = []

        if not obj_list:
            self.inform.emit("[warning_notcl] No object selected.")
            msg = "Please Select an object to flip!"
            warningbox = QtWidgets.QMessageBox()
            warningbox.setText(msg)
            warningbox.setWindowTitle("Warning ...")
            warningbox.setWindowIcon(QtGui.QIcon('share/warning.png'))
            warningbox.setStandardButtons(QtWidgets.QMessageBox.Ok)
            warningbox.setDefaultButton(QtWidgets.QMessageBox.Ok)
            warningbox.exec_()
        else:
            try:
                # first get a bounding box to fit all
                for obj in obj_list:
                    xmin, ymin, xmax, ymax = obj.bounds()
                    xminlist.append(xmin)
                    yminlist.append(ymin)
                    xmaxlist.append(xmax)
                    ymaxlist.append(ymax)

                # get the minimum x,y and maximum x,y for all objects selected
                xminimal = min(xminlist)
                yminimal = min(yminlist)
                xmaximal = max(xmaxlist)
                ymaximal = max(ymaxlist)

                px = 0.5 * (xminimal + xmaximal)
                py = 0.5 * (yminimal + ymaximal)

                # execute mirroring
                for obj in obj_list:
                    obj.mirror('Y', [px, py])
                    obj.plot()
                    self.object_changed.emit(obj)
            except Exception as e:
                self.inform.emit("[error_notcl] Due of %s, Flip action was not executed." % str(e))
                return

    def on_rotate(self, silent=False, preset=None):
        obj_list = self.collection.get_selected()
        xminlist = []
        yminlist = []
        xmaxlist = []
        ymaxlist = []

        if not obj_list:
            self.inform.emit("[warning_notcl] No object selected.")
            msg = "Please Select an object to rotate!"
            warningbox = QtWidgets.QMessageBox()
            warningbox.setText(msg)
            warningbox.setWindowTitle("Warning ...")
            warningbox.setWindowIcon(QtGui.QIcon('share/warning.png'))
            warningbox.setStandardButtons(QtWidgets.QMessageBox.Ok)
            warningbox.setDefaultButton(QtWidgets.QMessageBox.Ok)
            warningbox.exec_()
        else:
            if silent is False:
                rotatebox = FCInputDialog(title="Transform", text="Enter the Angle value:",
                                          min=-360, max=360, decimals=3)
                num, ok = rotatebox.get_value()
            else:
                num = preset
                ok = True

            if ok:
                try:
                    # first get a bounding box to fit all
                    for obj in obj_list:
                        xmin, ymin, xmax, ymax = obj.bounds()
                        xminlist.append(xmin)
                        yminlist.append(ymin)
                        xmaxlist.append(xmax)
                        ymaxlist.append(ymax)

                    # get the minimum x,y and maximum x,y for all objects selected
                    xminimal = min(xminlist)
                    yminimal = min(yminlist)
                    xmaximal = max(xmaxlist)
                    ymaximal = max(ymaxlist)
                    px = 0.5 * (xminimal + xmaximal)
                    py = 0.5 * (yminimal + ymaximal)

                    for sel_obj in obj_list:
                        sel_obj.rotate(-num, point=(px, py))
                        sel_obj.plot()
                        self.object_changed.emit(sel_obj)
                except Exception as e:
                    self.inform.emit("[error_notcl] Due of %s, rotation movement was not executed." % str(e))
                    return

    def on_skewx(self):
        obj_list = self.collection.get_selected()
        xminlist = []
        yminlist = []

        if not obj_list:
            self.inform.emit("[warning_notcl] No object selected.")
            msg = "Please Select an object to skew/shear!"
            warningbox = QtWidgets.QMessageBox()
            warningbox.setText(msg)
            warningbox.setWindowTitle("Warning ...")
            warningbox.setWindowIcon(QtGui.QIcon('share/warning.png'))
            warningbox.setStandardButtons(QtWidgets.QMessageBox.Ok)
            warningbox.setDefaultButton(QtWidgets.QMessageBox.Ok)
            warningbox.exec_()
        else:
            skewxbox = FCInputDialog(title="Transform", text="Enter the Angle value:",
                                          min=-360, max=360, decimals=3)
            num, ok = skewxbox.get_value()
            if ok:
                # first get a bounding box to fit all
                for obj in obj_list:
                    xmin, ymin, xmax, ymax = obj.bounds()
                    xminlist.append(xmin)
                    yminlist.append(ymin)

                # get the minimum x,y and maximum x,y for all objects selected
                xminimal = min(xminlist)
                yminimal = min(yminlist)

                for obj in obj_list:
                    obj.skew(num, 0, point=(xminimal, yminimal))
                    obj.plot()
                    self.object_changed.emit(obj)

    def on_skewy(self):
        obj_list = self.collection.get_selected()
        xminlist = []
        yminlist = []

        if not obj_list:
            self.inform.emit("[warning_notcl] No object selected.")
            msg = "Please Select an object to skew/shear!"
            warningbox = QtWidgets.QMessageBox()
            warningbox.setText(msg)
            warningbox.setWindowTitle("Warning ...")
            warningbox.setWindowIcon(QtGui.QIcon('share/warning.png'))
            warningbox.setStandardButtons(QtWidgets.QMessageBox.Ok)
            warningbox.setDefaultButton(QtWidgets.QMessageBox.Ok)
            warningbox.exec_()
        else:
            skewybox = FCInputDialog(title="Transform", text="Enter the Angle value:",
                                          min=-360, max=360, decimals=3)
            num, ok = skewybox.get_value()
            if ok:
                # first get a bounding box to fit all
                for obj in obj_list:
                    xmin, ymin, xmax, ymax = obj.bounds()
                    xminlist.append(xmin)
                    yminlist.append(ymin)

                # get the minimum x,y and maximum x,y for all objects selected
                xminimal = min(xminlist)
                yminimal = min(yminlist)

                for obj in obj_list:
                    obj.skew(0, num, point=(xminimal, yminimal))
                    obj.plot()
                    self.object_changed.emit(obj)

    def delete_first_selected(self):
        # Keep this for later
        try:
            name = self.collection.get_active().options["name"]
        except AttributeError:
            self.log.debug("Nothing selected for deletion")
            return

        # Remove plot
        # self.plotcanvas.figure.delaxes(self.collection.get_active().axes)
        # self.plotcanvas.auto_adjust_axes()

        # Clear form
        self.setup_component_editor()

        # Remove from dictionary
        self.collection.delete_active()

        self.inform.emit("Object deleted: %s" % name)

    def on_plots_updated(self):
        """
        Callback used to report when the plots have changed.
        Adjust axes and zooms to fit.

        :return: None
        """
        # self.plotcanvas.auto_adjust_axes()
        self.plotcanvas.vispy_canvas.update()           # TODO: Need update canvas?
        self.on_zoom_fit(None)

    # TODO: Rework toolbar 'clear', 'replot' functions
    def on_toolbar_replot(self):
        """
        Callback for toolbar button. Re-plots all objects.

        :return: None
        """

        self.report_usage("on_toolbar_replot")
        self.log.debug("on_toolbar_replot()")

        try:
            self.collection.get_active().read_form()
        except AttributeError:
            self.log.debug("on_toolbar_replot(): AttributeError")
            pass

        self.plot_all()

    def on_row_activated(self, index):
        if index.isValid():
            if index.internalPointer().parent_item != self.collection.root_item:
                self.ui.notebook.setCurrentWidget(self.ui.selected_tab)

    def on_zoom_fit(self, event):
        """
        Callback for zoom-out request. This can be either from the corresponding
        toolbar button or the '1' key when the canvas is focused. Calls ``self.adjust_axes()``
        with axes limits from the geometry bounds of all objects.

        :param event: Ignored.
        :return: None
        """

        self.plotcanvas.fit_view()

    def grid_status(self):
        if self.ui.grid_snap_btn.isChecked():
            return 1
        else:
            return 0

    def on_key_over_plot(self, event):
        """
        Callback for the key pressed event when the canvas is focused. Keyboard
        shortcuts are handled here. So far, these are the shortcuts:

        ==========  ============================================
        Key         Action
        ==========  ============================================
        '1'         Zoom-fit. Fits the axes limits to the data.
        '2'         Zoom-out.
        '3'         Zoom-in.
        'ctrl+m'         Toggle on-off the measuring tool.
        ==========  ============================================

        :param event: Ignored.
        :return: None
        """

        self.key_modifiers = QtWidgets.QApplication.keyboardModifiers()

        if self.key_modifiers == QtCore.Qt.ControlModifier:
            if event.key == 'A':
                self.on_selectall()

            if event.key == 'C':
                self.on_copy_object()

            if event.key == 'E':
                self.on_fileopenexcellon()
            if event.key == 'G':
                self.on_fileopengerber()

            if event.key == 'N':
                self.on_file_new_click()

            if event.key == 'M':
                self.measurement_tool.run()

            if event.key == 'O':
                self.on_file_openproject()

            if event.key == 'S':
                self.on_file_saveproject()

            return
        elif self.key_modifiers == QtCore.Qt.AltModifier:
            # place holder for further shortcut key
            if event.key == 'C':
                self.calculator_tool.run()

            if event.key == 'D':
                self.dblsidedtool.run()

            if event.key == 'L':
                self.film_tool.run()

            if event.key == 'N':
                self.ncclear_tool.run()

            if event.key == 'P':
                self.paint_tool.run()

            if event.key == 'R':
                self.transform_tool.run()

            if event.key == 'U':
                self.cutout_tool.run()

            if event.key == 'Z':
                self.panelize_tool.run()

        elif self.key_modifiers == QtCore.Qt.ShiftModifier:
            # place holder for further shortcut key

            if event.key == 'C':
                self.on_copy_name()

            # Toggle axis
            if event.key == 'G':
                self.on_toggle_axis()

            # Open Preferences Window
            if event.key == 'P':
                self.on_preferences()

            # Rotate Object by 90 degree CCW
            if event.key == 'R':
                self.on_rotate(silent=True, preset=-90)

            # Run a Script
            if event.key == 'S':
                self.on_filerunscript()

            # Toggle Workspace
            if event.key == 'W':
                self.on_workspace_menu()

            # Skew on X axis
            if event.key == 'X':
                self.on_skewx()

            # Skew on Y axis
            if event.key == 'Y':
                self.on_skewy()

            return
        else:
            if event.key == 'F1':
                webbrowser.open(self.manual_url)
                return

            if event.key == 'F2':
                webbrowser.open(self.video_url)
                return

            if event.key == self.defaults['fit_key']:  # 1
                self.on_zoom_fit(None)
                return

            if event.key == self.defaults['zoom_out_key']:  # 2
                self.plotcanvas.zoom(1 / self.defaults['zoom_ratio'], self.mouse)
                return

            if event.key == self.defaults['zoom_in_key']:  # 3
                self.plotcanvas.zoom(self.defaults['zoom_ratio'], self.mouse)
                return

            if event.key == 'Delete':
                self.on_delete()
                return

            if event.key == 'Space':
                if self.collection.get_active() is not None:
                    self.collection.get_active().ui.plot_cb.toggle()
                    self.delete_selection_shape()

            if event.key == 'E':
                self.object2editor()

            if event.key == self.defaults['grid_toggle_key']:  # G
                self.ui.grid_snap_btn.trigger()

            if event.key == 'J':
                self.on_jump_to()

            if event.key == 'L':
                self.new_excellon_object()

            if event.key == 'M':
                self.move_tool.toggle()
                return

            if event.key == 'N':
                self.on_new_geometry()

            if event.key == 'O':
                self.on_set_origin()

            if event.key == 'P':
                self.properties_tool.run()

            if event.key == 'Q':
                self.on_toggle_units_click()

            if event.key == 'R':
                self.on_rotate(silent=True, preset=90)

            if event.key == 'S':
                self.on_toggle_shell()

            if event.key == 'V':
                self.on_zoom_fit(None)

            if event.key == 'X':
                self.on_flipx()

            if event.key == 'Y':
                self.on_flipy()

            if event.key == '`':
                self.on_shortcut_list()

    def on_key_release_over_plot(self, event):
        modifiers = QtWidgets.QApplication.keyboardModifiers()

        if modifiers == QtCore.Qt.ControlModifier:
            return
        elif modifiers == QtCore.Qt.AltModifier:
            # place holder for further shortcut key
            return
        elif modifiers == QtCore.Qt.ShiftModifier:
            # place holder for further shortcut key
            return
        else:
            return

    def on_shortcut_list(self):

        msg = '''<b>Shortcut list</b><br>
<br>
<b>~:</b>       Show Shortcut List<br>
<br>
<b>1:</b>       Zoom Fit<br>
<b>2:</b>       Zoom Out<br>
<b>3:</b>       Zoom In<br>
<b>A:</b>       Draw an Arc (when in Edit Mode)<br>
<b>C:</b>       Copy Geo Item (when in Edit Mode)<br>
<b>E:</b>       Edit Object (if selected)<br>
<b>G:</b>       Grid On/Off<br>
<b>J:</b>       Jump to Coordinates<br>
<b>L:</b>       New Excellon<br>
<b>M:</b>       Move Obj<br>
<b>M:</b>       Move Geo Item (when in Edit Mode)<br>
<b>N:</b>       New Geometry<br>
<b>N:</b>       Draw a Polygon (when in Edit Mode)<br>
<b>O:</b>       Set Origin<br>
<b>O:</b>       Draw a Circle (when in Edit Mode)<br>
<b>Q:</b>       Change Units<br>
<b>P:</b>       Open Properties Tool<br>
<b>P:</b>       Draw a Path (when in Edit Mode)<br>
<b>R:</b>       Rotate by 90 degree CW<br>
<b>R:</b>       Draw Rectangle (when in Edit Mode)<br>
<b>S:</b>       Shell Toggle<br>
<b>V:</b>       View Fit<br>
<b>X:</b>       Flip on X_axis<br>
<b>Y:</b>       Flip on Y_axis<br>
<br>
<b>Space:</b>    En(Dis)able Obj Plot<br>
<b>CTRL+A:</b>   Select All<br>
<b>CTRL+C:</b>   Copy Obj<br>
<b>CTRL+E:</b>   Open Excellon File<br>
<b>CTRL+G:</b>   Open Gerber File<br>
<b>CTRL+N:</b>   New Project<br>
<b>CTRL+M:</b>   Measurement Tool<br>
<b>CTRL+O:</b>   Open Project<br>
<b>CTRL+S:</b>   Save Project As<br>
<b>CTRL+S:</b>   Save Object and Exit Editor (when in Edit Mode)<br>
<br>
<b>SHIFT+C:</b>  Copy Obj_Name<br>
<b>SHIFT+G:</b>  Toggle the axis<br>
<b>SHIFT+P:</b>  Open Preferences Window<br>
<b>SHIFT+R:</b>  Rotate by 90 degree CCW<br>
<b>SHIFT+S:</b>  Run a Script<br>
<b>SHIFT+W:</b>  Toggle the workspace<br>
<b>SHIFT+X:</b>  Skew on X axis<br>
<b>SHIFT+Y:</b>  Skew on Y axis<br>
<br>
<b>ALT+C:</b>    Calculators Tool<br>
<b>ALT+D:</b>    2-Sided PCB Tool<br>
<b>ALT+L:</b>    Film PCB Tool<br>
<b>ALT+N:</b>    Non-Copper Clearing Tool<br>
<b>ALT+P:</b>    Paint Area Tool<br>
<b>ALT+R:</b>    Transformation Tool<br>
<b>ALT+U:</b>    Cutout PCB Tool<br>
<br>
<b>F1:</b>       Open Online Manual<br>
<b>F2:</b>       Open Online Tutorials<br>
<b>Del:</b>      Delete Obj
'''

        helpbox = QtWidgets.QMessageBox()
        helpbox.setText(msg)
        helpbox.setWindowTitle("Help")
        helpbox.setWindowIcon(QtGui.QIcon('share/help.png'))
        helpbox.setStandardButtons(QtWidgets.QMessageBox.Ok)
        helpbox.setDefaultButton(QtWidgets.QMessageBox.Ok)
        helpbox.exec_()

    def on_copy_name(self):
        obj = self.collection.get_active()
        try:
            name = obj.options["name"]
        except AttributeError:
            log.debug("on_copy_name() --> No object selected to copy it's name")
            self.inform.emit("[warning_notcl]No object selected to copy it's name")
            return

        self.clipboard.setText(name)
        self.inform.emit("Name copied on clipboard ...")

    def on_mouse_click_over_plot(self, event):
        """
        Callback for the mouse click event over the plot. This event is generated
        by the Matplotlib backend and has been registered in ``self.__init__()``.
        For details, see: http://matplotlib.org/users/event_handling.html

        Default actions are:

        * Copy coordinates to clipboard. Ex.: (65.5473, -13.2679)

        :param event: Contains information about the event, like which button
            was clicked, the pixel coordinates and the axes coordinates.
        :return: None
        """
        self.pos = []

        # So it can receive key presses
        self.plotcanvas.vispy_canvas.native.setFocus()
        # Set the mouse button for panning
        self.plotcanvas.vispy_canvas.view.camera.pan_button_setting = self.defaults['global_pan_button']

        self.pos_canvas = self.plotcanvas.vispy_canvas.translate_coords(event.pos)

        if self.grid_status() == True:
            self.pos = self.geo_editor.snap(self.pos_canvas[0], self.pos_canvas[1])
            self.app_cursor.enabled = True
        else:
            self.pos = (self.pos_canvas[0], self.pos_canvas[1])
            self.app_cursor.enabled = False

        try:
            App.log.debug('button=%d, x=%d, y=%d, xdata=%f, ydata=%f' % (
            event.button, event.pos[0], event.pos[1], self.pos[0], self.pos[1]))
            modifiers = QtWidgets.QApplication.keyboardModifiers()

            if event.button == 1:
                # Reset here the relative coordinates so there is a new reference on the click position
                if self.rel_point1 is None:
                    self.rel_point1 = self.pos
                else:
                    self.rel_point2 = copy(self.rel_point1)
                    self.rel_point1 = self.pos

                # If the SHIFT key is pressed when LMB is clicked then the coordinates are copied to clipboard
                if modifiers == QtCore.Qt.ShiftModifier:
                    self.clipboard.setText(self.defaults["global_point_clipboard_format"] % (self.pos[0], self.pos[1]))
                    return

                # If the CTRL key is pressed when the LMB is clicked then if the object is selected it will deselect,
                # and if it's not selected then it will be selected
                if modifiers == QtCore.Qt.ControlModifier:
                    # If there is no active command (self.command_active is None) then we check if we clicked on
                    # a object by checking the bounding limits against mouse click position
                    if self.command_active is None:
                        self.select_objects(key='CTRL')
                else:
                    # If there is no active command (self.command_active is None) then we check if we clicked on a object by
                    # checking the bounding limits against mouse click position
                    if self.command_active is None:
                        self.select_objects()

            self.on_mouse_move_over_plot(event, origin_click=True)
        except Exception as e:
            App.log.debug("App.on_mouse_click_over_plot() --> Outside plot? --> %s" % str(e))

    def on_double_click_over_plot(self, event):
        # make double click work only for the LMB
        if event.button == 1:
            if not self.collection.get_selected():
                pass
            else:
                self.ui.notebook.setCurrentWidget(self.ui.selected_tab)
                #delete the selection shape(S) as it may be in the way
                self.delete_selection_shape()

    def on_mouse_move_over_plot(self, event, origin_click=None):
        """
        Callback for the mouse motion event over the plot. This event is generated
        by the Matplotlib backend and has been registered in ``self.__init__()``.
        For details, see: http://matplotlib.org/users/event_handling.html

        :param event: Contains information about the event.
        :param origin_click
        :return: None
        """

        # So it can receive key presses
        self.plotcanvas.vispy_canvas.native.setFocus()
        self.pos_jump = event.pos

        if origin_click is True:
            pass
        else:
            # if the RMB is clicked and mouse is moving over plot then 'panning_action' is True
            if event.button == 2:
                self.panning_action = True
                return
            else:
                self.panning_action = False

        if self.rel_point1 is not None:
            try:  # May fail in case mouse not within axes
                pos_canvas = self.plotcanvas.vispy_canvas.translate_coords(event.pos)
                if self.grid_status():
                    pos = self.geo_editor.snap(pos_canvas[0], pos_canvas[1])
                    self.app_cursor.enabled = True
                    # Update cursor
                    self.app_cursor.set_data(np.asarray([(pos[0], pos[1])]), symbol='++', edge_color='black', size=20)
                else:
                    pos = (pos_canvas[0], pos_canvas[1])
                    self.app_cursor.enabled = False

                self.ui.position_label.setText("&nbsp;&nbsp;&nbsp;&nbsp;<b>X</b>: %.4f&nbsp;&nbsp;   "
                                               "<b>Y</b>: %.4f" % (pos[0], pos[1]))

                dx = pos[0] - self.rel_point1[0]
                dy = pos[1] - self.rel_point1[1]
                self.ui.rel_position_label.setText("<b>Dx</b>: %.4f&nbsp;&nbsp;  <b>Dy</b>: "
                                                   "%.4f&nbsp;&nbsp;&nbsp;&nbsp;" % (dx, dy))
                self.mouse = [pos[0], pos[1]]

                # if the mouse is moved and the LMB is clicked then the action is a selection
                if event.is_dragging == 1 and event.button == 1:
                    self.delete_selection_shape()
                    if dx < 0:
                        self.draw_moving_selection_shape(self.pos, pos, color=self.defaults['global_alt_sel_line'],
                                                     face_color=self.defaults['global_alt_sel_fill'])
                        self.selection_type = False
                    else:
                        self.draw_moving_selection_shape(self.pos, pos)
                        self.selection_type = True

                # delete the status message on mouse move
                # self.inform.emit("")

            except:
                self.ui.position_label.setText("")
                self.ui.rel_position_label.setText("")
                self.mouse = None

    def on_mouse_click_release_over_plot(self, event):
        """
        Callback for the mouse click release over plot. This event is generated by the Matplotlib backend
        and has been registered in ''self.__init__()''.
        :param event: contains information about the event.
        :return:
        """

        pos_canvas = self.plotcanvas.vispy_canvas.translate_coords(event.pos)
        if self.grid_status():
            pos = self.geo_editor.snap(pos_canvas[0], pos_canvas[1])
        else:
            pos = (pos_canvas[0], pos_canvas[1])

        # if the released mouse button was RMB then test if it was a panning motion or not, if not it was a context
        # canvas menu
        try:
            if event.button == 2:  # right click
                if self.panning_action is True:
                    self.panning_action = False
                else:
                    self.cursor = QtGui.QCursor()
                    self.ui.popMenu.popup(self.cursor.pos())
        except Exception as e:
            log.warning("Error: %s" % str(e))
            return

        # if the released mouse button was LMB then test if we had a right-to-left selection or a left-to-right
        # selection and then select a type of selection ("enclosing" or "touching")
        try:
            if event.button == 1:  # left click
                if self.selection_type is not None:
                    self.selection_area_handler(self.pos, pos, self.selection_type)
                    self.selection_type = None
        except Exception as e:
            log.warning("Error: %s" % str(e))
            return

    def selection_area_handler(self, start_pos, end_pos, sel_type):
        """

        :param start_pos: mouse position when the selection LMB click was done
        :param end_pos: mouse position when the left mouse button is released
        :param sel_type: if True it's a left to right selection (enclosure), if False it's a 'touch' selection
        :return:
        """
        poly_selection = Polygon([start_pos, (end_pos[0], start_pos[1]), end_pos, (start_pos[0], end_pos[1])])

        self.delete_selection_shape()
        for obj in self.collection.get_list():
            try:
                # select the object(s) only if it is enabled (plotted)
                if obj.options['plot']:
                    poly_obj = Polygon([(obj.options['xmin'], obj.options['ymin']), (obj.options['xmax'], obj.options['ymin']),
                                        (obj.options['xmax'], obj.options['ymax']), (obj.options['xmin'], obj.options['ymax'])])
                    if sel_type is True:
                        if poly_obj.within(poly_selection):
                            # create the selection box around the selected object
                            self.draw_selection_shape(obj)
                            self.collection.set_active(obj.options['name'])
                    else:
                        if poly_selection.intersects(poly_obj):
                            # create the selection box around the selected object
                            self.draw_selection_shape(obj)
                            self.collection.set_active(obj.options['name'])
            except:
                # the Exception here will happen if we try to select on screen and we have an newly (and empty)
                # just created Geometry or Excellon object that do not have the xmin, xmax, ymin, ymax options.
                # In this case poly_obj creation (see above) will fail
                pass

    def select_objects(self, key=None):
        # list where we store the overlapped objects under our mouse left click position
        objects_under_the_click_list = []

        # Populate the list with the overlapped objects on the click position
        curr_x, curr_y = self.pos
        for obj in self.all_objects_list:
            if (curr_x >= obj.options['xmin']) and (curr_x <= obj.options['xmax']) and \
                    (curr_y >= obj.options['ymin']) and (curr_y <= obj.options['ymax']):
                if obj.options['name'] not in objects_under_the_click_list:
                    if obj.options['plot']:
                        # add objects to the objects_under_the_click list only if the object is plotted
                        # (active and not disabled)
                        objects_under_the_click_list.append(obj.options['name'])
        try:
            # If there is no element in the overlapped objects list then make everyone inactive
            # because we selected "nothing"
            if not objects_under_the_click_list:
                self.collection.set_all_inactive()
                # delete the possible selection box around a possible selected object
                self.delete_selection_shape()
                # and as a convenience move the focus to the Project tab because Selected tab is now empty
                self.ui.notebook.setCurrentWidget(self.ui.project_tab)

            else:
                # case when there is only an object under the click and we toggle it
                if len(objects_under_the_click_list) == 1:
                    if self.collection.get_active() is None :
                        self.collection.set_active(objects_under_the_click_list[0])
                        # create the selection box around the selected object
                        curr_sel_obj = self.collection.get_active()
                        self.draw_selection_shape(curr_sel_obj)
                    elif self.collection.get_active().options['name'] not in objects_under_the_click_list:
                        self.collection.set_all_inactive()
                        self.delete_selection_shape()
                        self.collection.set_active(objects_under_the_click_list[0])
                        # create the selection box around the selected object
                        curr_sel_obj = self.collection.get_active()
                        self.draw_selection_shape(curr_sel_obj)
                    else:
                        self.collection.set_all_inactive()
                        self.delete_selection_shape()
                else:
                    # If there is no selected object
                    # make active the first element of the overlapped objects list
                    if self.collection.get_active() is None:
                        self.collection.set_active(objects_under_the_click_list[0])

                    name_sel_obj = self.collection.get_active().options['name']
                    # In case that there is a selected object but it is not in the overlapped object list
                    # make that object inactive and activate the first element in the overlapped object list
                    if name_sel_obj not in objects_under_the_click_list:
                        self.collection.set_inactive(name_sel_obj)
                        name_sel_obj = objects_under_the_click_list[0]
                        self.collection.set_active(name_sel_obj)
                    else:
                        name_sel_obj_idx = objects_under_the_click_list.index(name_sel_obj)
                        self.collection.set_all_inactive()
                        self.collection.set_active(objects_under_the_click_list[(name_sel_obj_idx + 1) % len(objects_under_the_click_list)])

                    curr_sel_obj = self.collection.get_active()
                    # delete the possible selection box around a possible selected object
                    self.delete_selection_shape()
                    # create the selection box around the selected object
                    self.draw_selection_shape(curr_sel_obj)

                    # for obj in self.collection.get_list():
                    #     obj.plot()
                    # curr_sel_obj.plot(color=self.FC_dark_blue, face_color=self.FC_light_blue)

                    # TODO: on selected objects change the object colors and do not draw the selection box
                    # self.plotcanvas.vispy_canvas.update() # this updates the canvas
        except Exception as e:
            log.error("[error] Something went bad. %s" % str(e))
            return

    def delete_selection_shape(self):
        self.move_tool.sel_shapes.clear()
        self.move_tool.sel_shapes.redraw()

    def draw_selection_shape(self, sel_obj):
        """

        :param sel_obj: the object for which the selection shape must be drawn
        :return:
        """

        pt1 = (float(sel_obj.options['xmin']), float(sel_obj.options['ymin']))
        pt2 = (float(sel_obj.options['xmax']), float(sel_obj.options['ymin']))
        pt3 = (float(sel_obj.options['xmax']), float(sel_obj.options['ymax']))
        pt4 = (float(sel_obj.options['xmin']), float(sel_obj.options['ymax']))
        sel_rect = Polygon([pt1, pt2, pt3, pt4])

        #blue_t = Color('blue')
        blue_t = Color(self.defaults['global_sel_fill'])
        blue_t.alpha = 0.3
        self.sel_objects_list.append(self.move_tool.sel_shapes.add(sel_rect, color=self.defaults['global_sel_line'],
                                                               face_color=blue_t, update=True, layer=0, tolerance=None))

    def draw_moving_selection_shape(self, old_coords, coords, **kwargs):
        """

        :param old_coords: old coordinates
        :param coords: new coordinates
        :return:
        """

        if 'color' in kwargs:
            color = kwargs['color']
        else:
            color = self.defaults['global_sel_line']

        if 'face_color' in kwargs:
            face_color = kwargs['face_color']
        else:
            face_color = self.defaults['global_sel_fill']
        x0, y0 = old_coords
        x1, y1 = coords
        pt1 = (x0, y0)
        pt2 = (x1, y0)
        pt3 = (x1, y1)
        pt4 = (x0, y1)
        sel_rect = Polygon([pt1, pt2, pt3, pt4])

        color_t = Color(face_color)
        color_t.alpha = 0.3
        self.move_tool.sel_shapes.add(sel_rect, color=color, face_color=color_t, update=True,
                                      layer=0, tolerance=None)

    def on_file_new_click(self):
        if self.collection.get_list():
            msgbox = QtWidgets.QMessageBox()
            # msgbox.setText("<B>Save changes ...</B>")
            msgbox.setText("There are files/objects opened in FlatCAM.\n"
                           "Creating a New project will delete them.\n"
                           "Do you want to Save the project?")
            msgbox.setWindowTitle("Save changes")
            msgbox.setWindowIcon(QtGui.QIcon('share/save_as.png'))
            msgbox.setStandardButtons(QtWidgets.QMessageBox.Cancel | QtWidgets.QMessageBox.Yes |
                                      QtWidgets.QMessageBox.No)
            msgbox.setDefaultButton(QtWidgets.QMessageBox.Ok)

            response = msgbox.exec_()

            if response == QtWidgets.QMessageBox.Yes:
                self.on_file_saveprojectas()
            elif response == QtWidgets.QMessageBox.Cancel:
                return
            self.on_file_new()
        else:
            self.on_file_new()
        self.inform.emit("[success] New Project created...")

    def on_file_new(self):
        """
        Callback for menu item File->New. Returns the application to its
        startup state. This method is thread-safe.

        :return: None
        """

        self.report_usage("on_file_new")

        # Remove everything from memory
        App.log.debug("on_file_new()")

        # Clear pool
        self.clear_pool()

        # tcl needs to be reinitialized, otherwise  old shell variables etc  remains
        self.init_tcl()

        self.delete_selection_shape()

        self.collection.delete_all()

        self.setup_component_editor()

        # Clear project filename
        self.project_filename = None

        # Load the application defaults
        self.load_defaults(filename='current_defaults')

        # Re-fresh project options
        self.on_options_app2project()

        # Init Tools
        self.init_tools()

        # take the focus of the Notebook on Project Tab.
        self.ui.notebook.setCurrentWidget(self.ui.project_tab)

    def obj_properties(self):
        self.properties_tool.run()

    def obj_move(self):
        self.move_tool.run()

    def on_fileopengerber(self):
        """
        File menu callback for opening a Gerber.

        :return: None
        """

        self.report_usage("on_fileopengerber")
        App.log.debug("on_fileopengerber()")

        _filter_ = "Gerber Files (*.gbr *.ger *.gtl *.gbl *.gts *.gbs *.gtp *.gbp *.gto *.gbo *.gm1 *.gml *.gm3 *.gko " \
                   "*.cmp *.sol *.stc *.sts *.plc *.pls *.crc *.crs *.tsm *.bsm *.ly2 *.ly15 *.dim *.mil *.grb" \
                   "*.top *.bot *.smt *.smb *.sst *.ssb *.spt *.spb *.pho *.gdo *.art *.gbd);;" \
                   "Protel Files (*.gtl *.gbl *.gts *.gbs *.gto *.gbo *.gtp *.gbp *.gml *.gm1 *.gm3 *.gko);;" \
                   "Eagle Files (*.cmp *.sol *.stc *.sts *.plc *.pls *.crc *.crs *.tsm *.bsm *.ly2 *.ly15 *.dim *.mil);;" \
                   "OrCAD Files (*.top *.bot *.smt *.smb *.sst *.ssb *.spt *.spb);;" \
                   "Allegro Files (*.art);;" \
                   "Mentor Files (*.pho *.gdo);;" \
                   "All Files (*.*)"

        try:
            filenames, _ = QtWidgets.QFileDialog.getOpenFileNames(caption="Open Gerber",
                                                         directory=self.get_last_folder(), filter=_filter_)
        except TypeError:
            filenames, _ = QtWidgets.QFileDialog.getOpenFileNames(caption="Open Gerber", filter=_filter_)

        filenames = [str(filename) for filename in filenames]

        if len(filenames) == 0:
            self.inform.emit("[warning_notcl]Open Gerber cancelled.")
        else:
            for filename in filenames:
                if filename != '':
                    self.worker_task.emit({'fcn': self.open_gerber,
                                           'params': [filename]})

    def on_fileopengerber_follow(self):
        """
        File menu callback for opening a Gerber.

        :return: None
        """

        self.report_usage("on_fileopengerber_follow")
        App.log.debug("on_fileopengerber_follow()")
        _filter_ = "Gerber Files (*.gbr *.ger *.gtl *.gbl *.gts *.gbs *.gtp *.gbp *.gto *.gbo *.gm1 *.gml *.gm3 *.gko " \
                   "*.cmp *.sol *.stc *.sts *.plc *.pls *.crc *.crs *.tsm *.bsm *.ly2 *.ly15 *.dim *.mil *.grb" \
                   "*.top *.bot *.smt *.smb *.sst *.ssb *.spt *.spb *.pho *.gdo *.art *.gbd);;" \
                   "Protel Files (*.gtl *.gbl *.gts *.gbs *.gto *.gbo *.gtp *.gbp *.gml *.gm1 *.gm3 *.gko);;" \
                   "Eagle Files (*.cmp *.sol *.stc *.sts *.plc *.pls *.crc *.crs *.tsm *.bsm *.ly2 *.ly15 *.dim *.mil);;" \
                   "OrCAD Files (*.top *.bot *.smt *.smb *.sst *.ssb *.spt *.spb);;" \
                   "Allegro Files (*.art);;" \
                   "Mentor Files (*.pho *.gdo);;" \
                   "All Files (*.*)"
        try:
            filename, _ = QtWidgets.QFileDialog.getOpenFileName(caption="Open Gerber with Follow",
                                                         directory=self.get_last_folder(), filter=_filter_)
        except TypeError:
            filename, _ = QtWidgets.QFileDialog.getOpenFileName(caption="Open Gerber with Follow", filter=_filter_)

        # The Qt methods above will return a QString which can cause problems later.
        # So far json.dump() will fail to serialize it.
        # TODO: Improve the serialization methods and remove this fix.
        filename = str(filename)
        follow = True

        if filename == "":
            self.inform.emit("[warning_notcl]Open Gerber-Follow cancelled.")
        else:
            self.worker_task.emit({'fcn': self.open_gerber,
                                   'params': [filename, follow]})

    def on_fileopenexcellon(self):
        """
        File menu callback for opening an Excellon file.

        :return: None
        """

        self.report_usage("on_fileopenexcellon")
        App.log.debug("on_fileopenexcellon()")

        _filter_ = "Excellon Files (*.drl *.txt *.xln *.drd *.tap *.exc);;" \
                   "All Files (*.*)"

        try:
            filenames, _ = QtWidgets.QFileDialog.getOpenFileNames(caption="Open Excellon",
                                                         directory=self.get_last_folder(), filter=_filter_)
        except TypeError:
            filenames, _ = QtWidgets.QFileDialog.getOpenFileNames(caption="Open Excellon", filter=_filter_)

        filenames = [str(filename) for filename in filenames]

        if len(filenames) == 0:
            self.inform.emit("[warning_notcl]Open Excellon cancelled.")
        else:
            for filename in filenames:
                if filename != '':
                    self.worker_task.emit({'fcn': self.open_excellon,
                                           'params': [filename]})

    def on_fileopengcode(self):
        """
        File menu call back for opening gcode.

        :return: None
        """

        self.report_usage("on_fileopengcode")
        App.log.debug("on_fileopengcode()")

        # https://bobcadsupport.com/helpdesk/index.php?/Knowledgebase/Article/View/13/5/known-g-code-file-extensions
        _filter_ = "G-Code Files (*.txt *.nc *.ncc *.tap *.gcode *.cnc *.ecs *.fnc *.dnc *.ncg *.gc *.fan *.fgc" \
                   " *.din *.xpi *.hnc *.h *.i *.ncp *.min *.gcd *.rol *.mpr *.ply *.out *.eia *.plt *.sbp *.mpf);;" \
                   "All Files (*.*)"
        try:
            filenames, _ = QtWidgets.QFileDialog.getOpenFileNames(caption="Open G-Code",
                                                         directory=self.get_last_folder(), filter=_filter_)
        except TypeError:
            filenames, _ = QtWidgets.QFileDialog.getOpenFileNames(caption="Open G-Code", filter=_filter_)

        filenames = [str(filename) for filename in filenames]

        if len(filenames) == 0:
            self.inform.emit("[warning_notcl]Open G-Code cancelled.")
        else:
            for filename in filenames:
                if filename != '':
                    self.worker_task.emit({'fcn': self.open_gcode,
                                           'params': [filename]})

    def on_file_openproject(self):
        """
        File menu callback for opening a project.

        :return: None
        """

        self.report_usage("on_file_openproject")
        App.log.debug("on_file_openproject()")
        _filter_ = "FlatCAM Project (*.FlatPrj);;All Files (*.*)"
        try:
            filename, _ = QtWidgets.QFileDialog.getOpenFileName(caption="Open Project",
                                                         directory=self.get_last_folder(), filter=_filter_)
        except TypeError:
            filename, _ = QtWidgets.QFileDialog.getOpenFileName(caption="Open Project", filter = _filter_)

        # The Qt methods above will return a QString which can cause problems later.
        # So far json.dump() will fail to serialize it.
        # TODO: Improve the serialization methods and remove this fix.
        filename = str(filename)

        if filename == "":
            self.inform.emit("[warning_notcl]Open Project cancelled.")
        else:
            # self.worker_task.emit({'fcn': self.open_project,
            #                        'params': [filename]})
            # The above was failing because open_project() is not
            # thread safe. The new_project()
            self.open_project(filename)

    def on_file_exportsvg(self):
        """
        Callback for menu item File->Export SVG.

        :return: None
        """
        self.report_usage("on_file_exportsvg")
        App.log.debug("on_file_exportsvg()")

        obj = self.collection.get_active()
        if obj is None:
            self.inform.emit("WARNING: No object selected.")
            msg = "Please Select a Geometry object to export"
            msgbox = QtWidgets.QMessageBox()
            msgbox.setInformativeText(msg)
            msgbox.setStandardButtons(QtWidgets.QMessageBox.Ok)
            msgbox.setDefaultButton(QtWidgets.QMessageBox.Ok)
            msgbox.exec_()
            return

        # Check for more compatible types and add as required
        if (not isinstance(obj, FlatCAMGeometry) and not isinstance(obj, FlatCAMGerber) and not isinstance(obj, FlatCAMCNCjob)
            and not isinstance(obj, FlatCAMExcellon)):
            msg = "[error_notcl] Only Geometry, Gerber and CNCJob objects can be used."
            msgbox = QtWidgets.QMessageBox()
            msgbox.setInformativeText(msg)
            msgbox.setStandardButtons(QtWidgets.QMessageBox.Ok)
            msgbox.setDefaultButton(QtWidgets.QMessageBox.Ok)
            msgbox.exec_()
            return

        name = self.collection.get_active().options["name"]

        filter = "SVG File (*.svg);;All Files (*.*)"
        try:
            filename, _ = QtWidgets.QFileDialog.getSaveFileName(caption="Export SVG",
                                                         directory=self.get_last_save_folder(), filter=filter)
        except TypeError:
            filename, _ = QtWidgets.QFileDialog.getSaveFileName(caption="Export SVG", filter=filter)

        filename = str(filename)

        if filename == "":
            self.inform.emit("[warning_notcl]Export SVG cancelled.")
            return
        else:
            self.export_svg(name, filename)
            self.file_saved.emit("SVG", filename)

    def on_file_exportpng(self):

        self.report_usage("on_file_exportpng")
        App.log.debug("on_file_exportpng()")

        image = _screenshot()
        data = np.asarray(image)
        if not data.ndim == 3 and data.shape[-1] in (3, 4):
            self.inform.emit('[[warning_notcl]] Data must be a 3D array with last dimension 3 or 4')
            return

        filter = "PNG File (*.png);;All Files (*.*)"
        try:
            filename, _ = QtWidgets.QFileDialog.getSaveFileName(caption="Export PNG Image",
                                                         directory=self.get_last_save_folder(), filter=filter)
        except TypeError:
            filename, _ = QtWidgets.QFileDialog.getSaveFileName(caption="Export PNG Image", filter=filter)

        filename = str(filename)

        if filename == "":
            self.inform.emit("Export PNG cancelled.")
            return
        else:
            write_png(filename, data)
            self.file_saved.emit("png", filename)

    def on_file_exportexcellon(self, altium_format=None):
        """
        Callback for menu item File->Export SVG.

        :return: None
        """
        self.report_usage("on_file_exportexcellon")
        App.log.debug("on_file_exportexcellon()")

        obj = self.collection.get_active()
        if obj is None:
            self.inform.emit("[warning_notcl] No object selected.")
            msg = "Please Select an Excellon object to export"
            msgbox = QtWidgets.QMessageBox()
            msgbox.setInformativeText(msg)
            msgbox.setStandardButtons(QtWidgets.QMessageBox.Ok)
            msgbox.setDefaultButton(QtWidgets.QMessageBox.Ok)
            msgbox.exec_()
            return

        # Check for more compatible types and add as required
        if not isinstance(obj, FlatCAMExcellon):
            msg = "[warning_notcl] Only Excellon objects can be used."
            msgbox = QtWidgets.QMessageBox()
            msgbox.setInformativeText(msg)
            msgbox.setStandardButtons(QtWidgets.QMessageBox.Ok)
            msgbox.setDefaultButton(QtWidgets.QMessageBox.Ok)
            msgbox.exec_()
            return

        name = self.collection.get_active().options["name"]

        filter = "Excellon File (*.drl);;Excellon File (*.txt);;All Files (*.*)"
        try:
            filename, _ = QtWidgets.QFileDialog.getSaveFileName(caption="Export Excellon",
                                                         directory=self.get_last_save_folder(), filter=filter)
        except TypeError:
            filename, _ = QtWidgets.QFileDialog.getSaveFileName(caption="Export Excellon", filter=filter)

        filename = str(filename)

        if filename == "":
            self.inform.emit("[warning_notcl]Export Excellon cancelled.")
            return
        else:
            if altium_format == None:
                self.export_excellon(name, filename)
                self.file_saved.emit("Excellon", filename)
            else:
                self.export_excellon(name, filename, altium_format=True)
                self.file_saved.emit("Excellon", filename)

    def on_file_exportdxf(self):
        """
                Callback for menu item File->Export DXF.

                :return: None
                """
        self.report_usage("on_file_exportdxf")
        App.log.debug("on_file_exportdxf()")

        obj = self.collection.get_active()
        if obj is None:
            self.inform.emit("W[warning_notcl] No object selected.")
            msg = "Please Select a Geometry object to export"
            msgbox = QtWidgets.QMessageBox()
            msgbox.setInformativeText(msg)
            msgbox.setStandardButtons(QtWidgets.QMessageBox.Ok)
            msgbox.setDefaultButton(QtWidgets.QMessageBox.Ok)
            msgbox.exec_()
            return

        # Check for more compatible types and add as required
        if not isinstance(obj, FlatCAMGeometry):
            msg = "[error_notcl] Only Geometry objects can be used."
            msgbox = QtWidgets.QMessageBox()
            msgbox.setInformativeText(msg)
            msgbox.setStandardButtons(QtWidgets.QMessageBox.Ok)
            msgbox.setDefaultButton(QtWidgets.QMessageBox.Ok)
            msgbox.exec_()
            return

        name = self.collection.get_active().options["name"]

        filter = "DXF File (*.DXF);;All Files (*.*)"
        try:
            filename, _ = QtWidgets.QFileDialog.getSaveFileName(caption="Export DXF",
                                                         directory=self.get_last_save_folder(), filter=filter)
        except TypeError:
            filename, _ = QtWidgets.QFileDialog.getSaveFileName(caption="Export DXF", filter=filter)

        filename = str(filename)

        if filename == "":
            self.inform.emit("[warning_notcl]Export DXF cancelled.")
            return
        else:
            self.export_dxf(name, filename)
            self.file_saved.emit("DXF", filename)

    def on_file_importsvg(self, type_of_obj):
        """
        Callback for menu item File->Import SVG.
        :param type_of_obj: to import the SVG as Geometry or as Gerber
        :type type_of_obj: str
        :return: None
        """
        self.report_usage("on_file_importsvg")
        App.log.debug("on_file_importsvg()")

        filter = "SVG File (*.svg);;All Files (*.*)"
        try:
            filenames, _ = QtWidgets.QFileDialog.getOpenFileNames(caption="Import SVG",
                                                         directory=self.get_last_folder(), filter=filter)
        except TypeError:
            filenames, _ = QtWidgets.QFileDialog.getOpenFileNames(caption="Import SVG", filter=filter)

        if type_of_obj is not "geometry" and type_of_obj is not "gerber":
            type_of_obj = "geometry"

        filenames = [str(filename) for filename in filenames]

        if len(filenames) == 0:
            self.inform.emit("[warning_notcl]Open SVG cancelled.")
        else:
            for filename in filenames:
                if filename != '':
                    self.worker_task.emit({'fcn': self.import_svg,
                                           'params': [filename, type_of_obj]})

    def on_file_importdxf(self, type_of_obj):
        """
        Callback for menu item File->Import DXF.
        :param type_of_obj: to import the DXF as Geometry or as Gerber
        :type type_of_obj: str
        :return: None
        """
        self.report_usage("on_file_importdxf")
        App.log.debug("on_file_importdxf()")

        filter = "DXF File (*.DXF);;All Files (*.*)"
        try:
            filenames, _ = QtWidgets.QFileDialog.getOpenFileNames(caption="Import DXF",
                                                         directory=self.get_last_folder(), filter=filter)
        except TypeError:
            filenames, _ = QtWidgets.QFileDialog.getOpenFileNames(caption="Import DXF", filter=filter)

        if type_of_obj is not "geometry" and type_of_obj is not "gerber":
            type_of_obj = "geometry"

        filenames = [str(filename) for filename in filenames]

        if len(filenames) == 0:
            self.inform.emit("[warning_notcl]Open DXF cancelled.")
        else:
            for filename in filenames:
                if filename != '':
                    self.worker_task.emit({'fcn': self.import_dxf,
                                           'params': [filename, type_of_obj]})

    def on_filerunscript(self):
        """
                File menu callback for loading and running a TCL script.

                :return: None
                """

        self.report_usage("on_filerunscript")
        App.log.debug("on_file_runscript()")
        _filter_ = "TCL script (*.TCL);;TCL script (*.TXT);;All Files (*.*)"
        try:
            filename, _ = QtWidgets.QFileDialog.getOpenFileName(caption="Open TCL script",
                                                         directory=self.get_last_folder(), filter=_filter_)
        except TypeError:
            filename, _ = QtWidgets.QFileDialog.getOpenFileName(caption="Open TCL script", filter=_filter_)

        # The Qt methods above will return a QString which can cause problems later.
        # So far json.dump() will fail to serialize it.
        # TODO: Improve the serialization methods and remove this fix.
        filename = str(filename)

        if filename == "":
            self.inform.emit("[warning_notcl]Open TCL script cancelled.")
        else:
            try:
                with open(filename, "r") as tcl_script:
                    cmd_line_shellfile_content = tcl_script.read()
                    self.shell._sysShell.exec_command(cmd_line_shellfile_content)
            except Exception as ext:
                print("ERROR: ", ext)
                sys.exit(2)

    def on_file_saveproject(self):
        """
        Callback for menu item File->Save Project. Saves the project to
        ``self.project_filename`` or calls ``self.on_file_saveprojectas()``
        if set to None. The project is saved by calling ``self.save_project()``.

        :return: None
        """

        self.report_usage("on_file_saveproject")

        if self.project_filename is None:
            self.on_file_saveprojectas()
        else:
            self.worker_task.emit({'fcn': self.save_project,
                                   'params': [self.project_filename]})
            # self.save_project(self.project_filename)

            self.file_opened.emit("project", self.project_filename)

            self.file_saved.emit("project", self.project_filename)

    def on_file_saveprojectas(self, make_copy=False, thread=True):
        """
        Callback for menu item File->Save Project As... Opens a file
        chooser and saves the project to the given file via
        ``self.save_project()``.

        :return: None
        """

        self.report_usage("on_file_saveprojectas")

        filter = "FlatCAM Project (*.FlatPrj);; All Files (*.*)"
        try:
            filename, _ = QtWidgets.QFileDialog.getSaveFileName(caption="Save Project As ...",
                                                         directory=self.get_last_save_folder(), filter=filter)
        except TypeError:
            filename, _ = QtWidgets.QFileDialog.getSaveFileName(caption="Save Project As ...", filter=filter)

        filename = str(filename)

        if filename == '':
            self.inform.emit("[warning_notcl]Save Project cancelled.")
            return

        try:
            f = open(filename, 'r')
            f.close()
            exists = True
        except IOError:
            exists = False

        msg = "File exists. Overwrite?"
        if exists:
            msgbox = QtWidgets.QMessageBox()
            msgbox.setInformativeText(msg)
            msgbox.setStandardButtons(QtWidgets.QMessageBox.Cancel |QtWidgets.QMessageBox.Ok)
            msgbox.setDefaultButton(QtWidgets.QMessageBox.Cancel)
            result = msgbox.exec_()
            if result ==QtWidgets.QMessageBox.Cancel:
                return

        if thread is True:
            self.worker_task.emit({'fcn': self.save_project,
                                   'params': [filename]})
        else:
            self.save_project(filename)

        # self.save_project(filename)
        self.file_opened.emit("project", filename)

        self.file_saved.emit("project", filename)
        if not make_copy:
            self.project_filename = filename

    def export_svg(self, obj_name, filename, scale_factor=0.00):
        """
        Exports a Geometry Object to an SVG file.

        :param filename: Path to the SVG file to save to.
        :return:
        """
        if filename is None:
            filename = self.defaults["global_last_save_folder"]

        self.log.debug("export_svg()")

        try:
            obj = self.collection.get_by_name(str(obj_name))
        except:
            # TODO: The return behavior has not been established... should raise exception?
            return "Could not retrieve object: %s" % obj_name

        with self.proc_container.new("Exporting SVG") as proc:
            exported_svg = obj.export_svg(scale_factor=scale_factor)

            # Determine bounding area for svg export
            bounds = obj.bounds()
            size = obj.size()

            # Convert everything to strings for use in the xml doc
            svgwidth = str(size[0])
            svgheight = str(size[1])
            minx = str(bounds[0])
            miny = str(bounds[1] - size[1])
            uom = obj.units.lower()

            # Add a SVG Header and footer to the svg output from shapely
            # The transform flips the Y Axis so that everything renders
            # properly within svg apps such as inkscape
            svg_header = '<svg xmlns="http://www.w3.org/2000/svg" ' \
                         'version="1.1" xmlns:xlink="http://www.w3.org/1999/xlink" '
            svg_header += 'width="' + svgwidth + uom + '" '
            svg_header += 'height="' + svgheight + uom + '" '
            svg_header += 'viewBox="' + minx + ' ' + miny + ' ' + svgwidth + ' ' + svgheight + '">'
            svg_header += '<g transform="scale(1,-1)">'
            svg_footer = '</g> </svg>'
            svg_elem = svg_header + exported_svg + svg_footer

            # Parse the xml through a xml parser just to add line feeds
            # and to make it look more pretty for the output
            svgcode = parse_xml_string(svg_elem)
            with open(filename, 'w') as fp:
                fp.write(svgcode.toprettyxml())

            self.file_saved.emit("SVG", filename)
            self.inform.emit("[success] SVG file exported to " + filename)

    def export_svg_negative(self, obj_name, box_name, filename, boundary, scale_factor=0.00, use_thread=True):
        """
        Exports a Geometry Object to an SVG file in negative.

        :param filename: Path to the SVG file to save to.
        :param: use_thread: If True use threads
        :type: Bool
        :return:
        """

        if filename is None:
            filename = self.defaults["global_last_save_folder"]

        self.log.debug("export_svg() negative")

        try:
            obj = self.collection.get_by_name(str(obj_name))
        except:
            # TODO: The return behavior has not been established... should raise exception?
            return "Could not retrieve object: %s" % obj_name

        try:
            box = self.collection.get_by_name(str(box_name))
        except:
            # TODO: The return behavior has not been established... should raise exception?
            return "Could not retrieve object: %s" % box_name

        if box is None:
            self.inform.emit("[warning_notcl]No object Box. Using instead %s" % obj)
            box = obj

        def make_negative_film():
            exported_svg = obj.export_svg(scale_factor=scale_factor)

            self.progress.emit(40)

            # Determine bounding area for svg export
            bounds = box.bounds()
            size = box.size()

            uom = obj.units.lower()

            # Convert everything to strings for use in the xml doc
            svgwidth = str(size[0] + (2 * boundary))
            svgheight = str(size[1] + (2 * boundary))
            minx = str(bounds[0] - boundary)
            miny = str(bounds[1] + boundary + size[1])
            miny_rect = str(bounds[1] - boundary)

            # Add a SVG Header and footer to the svg output from shapely
            # The transform flips the Y Axis so that everything renders
            # properly within svg apps such as inkscape
            svg_header = '<svg xmlns="http://www.w3.org/2000/svg" ' \
                         'version="1.1" xmlns:xlink="http://www.w3.org/1999/xlink" '
            svg_header += 'width="' + svgwidth + uom + '" '
            svg_header += 'height="' + svgheight + uom + '" '
            svg_header += 'viewBox="' + minx + ' -' + miny + ' ' + svgwidth + ' ' + svgheight + '" '
            svg_header += '>'
            svg_header += '<g transform="scale(1,-1)">'
            svg_footer = '</g> </svg>'

            self.progress.emit(60)

            # Change the attributes of the exported SVG
            # We don't need stroke-width - wrong, we do when we have lines with certain width
            # We set opacity to maximum
            # We set the color to WHITE
            root = ET.fromstring(exported_svg)
            for child in root:
                child.set('fill', '#FFFFFF')
                child.set('opacity', '1.0')
                child.set('stroke', '#FFFFFF')

            # first_svg_elem = 'rect x="' + minx + '" ' + 'y="' + miny_rect + '" '
            # first_svg_elem += 'width="' + svgwidth + '" ' + 'height="' + svgheight + '" '
            # first_svg_elem += 'fill="#000000" opacity="1.0" stroke-width="0.0"'

            first_svg_elem_tag = 'rect'
            first_svg_elem_attribs = {
                'x': minx,
                'y': miny_rect,
                'width': svgwidth,
                'height': svgheight,
                'id': 'neg_rect',
                'style': 'fill:#000000;opacity:1.0;stroke-width:0.0'
            }

            root.insert(0, ET.Element(first_svg_elem_tag, first_svg_elem_attribs))
            exported_svg = ET.tostring(root)

            svg_elem = svg_header + str(exported_svg) + svg_footer
            self.progress.emit(80)

            # Parse the xml through a xml parser just to add line feeds
            # and to make it look more pretty for the output
            doc = parse_xml_string(svg_elem)
            with open(filename, 'w') as fp:
                fp.write(doc.toprettyxml())

            self.progress.emit(100)

            self.file_saved.emit("SVG", filename)
            self.inform.emit("[success] SVG file exported to " + filename)

        if use_thread is True:
            proc = self.proc_container.new("Generating Film ... Please wait.")

            def job_thread_film(app_obj):
                try:
                    make_negative_film()
                except Exception as e:
                    proc.done()
                    return
                proc.done()

            self.worker_task.emit({'fcn': job_thread_film, 'params': [self]})
        else:
            make_negative_film()

    def export_svg_black(self, obj_name, box_name, filename, scale_factor=0.00, use_thread=True):
        """
        Exports a Geometry Object to an SVG file in negative.

        :param filename: Path to the SVG file to save to.
        :param: use_thread: If True use threads
        :type: Bool
        :return:
        """

        if filename is None:
            filename = self.defaults["global_last_save_folder"]

        self.log.debug("export_svg() black")

        try:
            obj = self.collection.get_by_name(str(obj_name))
        except:
            # TODO: The return behavior has not been established... should raise exception?
            return "Could not retrieve object: %s" % obj_name

        try:
            box = self.collection.get_by_name(str(box_name))
        except:
            # TODO: The return behavior has not been established... should raise exception?
            return "Could not retrieve object: %s" % box_name

        if box is None:
            self.inform.emit("[warning_notcl]No object Box. Using instead %s" % obj)
            box = obj

        def make_black_film():
            exported_svg = obj.export_svg(scale_factor=scale_factor)

            self.progress.emit(40)

            # Change the attributes of the exported SVG
            # We don't need stroke-width
            # We set opacity to maximum
            # We set the colour to WHITE
            root = ET.fromstring(exported_svg)
            for child in root:
                child.set('fill', '#000000')
                child.set('opacity', '1.0')
                child.set('stroke', '#000000')

            exported_svg = ET.tostring(root)

            # Determine bounding area for svg export
            bounds = box.bounds()
            size = box.size()

            # This contain the measure units
            uom = obj.units.lower()

            # Define a boundary around SVG of about 1.0mm (~39mils)
            if uom in "mm":
                boundary = 1.0
            else:
                boundary = 0.0393701

            self.progress.emit(80)

            # Convert everything to strings for use in the xml doc
            svgwidth = str(size[0] + (2 * boundary))
            svgheight = str(size[1] + (2 * boundary))
            minx = str(bounds[0] - boundary)
            miny = str(bounds[1] + boundary + size[1])

            self.log.debug(minx)
            self.log.debug(miny)

            # Add a SVG Header and footer to the svg output from shapely
            # The transform flips the Y Axis so that everything renders
            # properly within svg apps such as inkscape
            svg_header = '<svg xmlns="http://www.w3.org/2000/svg" ' \
                         'version="1.1" xmlns:xlink="http://www.w3.org/1999/xlink" '
            svg_header += 'width="' + svgwidth + uom + '" '
            svg_header += 'height="' + svgheight + uom + '" '
            svg_header += 'viewBox="' + minx + ' -' + miny + ' ' + svgwidth + ' ' + svgheight + '" '
            svg_header += '>'
            svg_header += '<g transform="scale(1,-1)">'
            svg_footer = '</g> </svg>'

            svg_elem = str(svg_header) + str(exported_svg) + str(svg_footer)

            self.progress.emit(90)

            # Parse the xml through a xml parser just to add line feeds
            # and to make it look more pretty for the output
            doc = parse_xml_string(svg_elem)
            with open(filename, 'w') as fp:
                fp.write(doc.toprettyxml())
            self.progress.emit(100)

            self.file_saved.emit("SVG", filename)
            self.inform.emit("[success] SVG file exported to " + filename)

        if use_thread is True:
            proc = self.proc_container.new("Generating Film ... Please wait.")

            def job_thread_film(app_obj):
                try:
                    make_black_film()
                except Exception as e:
                    proc.done()
                    return
                proc.done()

            self.worker_task.emit({'fcn': job_thread_film, 'params': [self]})
        else:
            make_black_film()

    def export_excellon(self, obj_name, filename, altium_format=None, use_thread=True):
        """
        Exports a Geometry Object to an Excellon file.

        :param filename: Path to the Excellon file to save to.
        :return:
        """
        if filename is None:
            filename = self.defaults["global_last_save_folder"]

        self.log.debug("export_excellon()")

        format_exc = ';FILE_FORMAT=2:4\n'
        units = ''

        try:
            obj = self.collection.get_by_name(str(obj_name))
        except:
            # TODO: The return behavior has not been established... should raise exception?
            return "Could not retrieve object: %s" % obj_name

        # updated units
        units = self.general_options_form.general_app_group.units_radio.get_value().upper()
        if units == 'IN' or units == 'INCH':
            units = 'INCH'

        elif units == 'MM' or units == 'METRIC':
            units ='METRIC'

        def make_excellon():
            try:
                time_str = "{:%A, %d %B %Y at %H:%M}".format(datetime.now())

                header = 'M48\n'
                header += ';EXCELLON GENERATED BY FLATCAM v%s - www.flatcam.org - Version Date: %s\n' % \
                          (str(self.app.version), str(self.app.version_date))

                header += ';Filename: %s' % str(obj_name) + '\n'
                header += ';Created on : %s' % time_str + '\n'

                if altium_format == None:
                    has_slots, excellon_code = obj.export_excellon()
                    header += units + '\n'

                    for tool in obj.tools:
                        if units == 'METRIC':
                            header += 'T' + str(tool) + 'F00S00' + 'C' + '%.2f' % float(obj.tools[tool]['C']) + '\n'
                        else:
                            header += 'T' + str(tool) + 'F00S00' + 'C' + '%.4f' % float(obj.tools[tool]['C']) + '\n'
                else:
                    has_slots, excellon_code = obj.export_excellon_altium()
                    header += 'INCH,LZ\n'
                    header += format_exc

                    for tool in obj.tools:
                        if units == 'METRIC':
                            header += 'T' + str(tool) + 'F00S00' + 'C' + \
                                      '%.4f' % (float(obj.tools[tool]['C']) / 25.4) + '\n'
                        else:
                            header += 'T' + str(tool) + 'F00S00' + 'C' + '%.4f' % float(obj.tools[tool]['C']) + '\n'

                header += '%\n'
                footer = 'M30\n'

                exported_excellon = header
                exported_excellon += excellon_code
                exported_excellon += footer

                with open(filename, 'w') as fp:
                    fp.write(exported_excellon)

                self.file_saved.emit("Excellon", filename)
                self.inform.emit("[success] Excellon file exported to " + filename)
            except:
                return 'fail'

        if use_thread is True:

            with self.proc_container.new("Exporting Excellon") as proc:

                def job_thread_exc(app_obj):
                    ret = make_excellon()
                    if ret == 'fail':
                        self.inform.emit('[error_notcl] Could not export Excellon file.')
                        return

                self.worker_task.emit({'fcn': job_thread_exc, 'params': [self]})
        else:
            ret = make_excellon()
            if ret == 'fail':
                self.inform.emit('[error_notcl] Could not export Excellon file.')
                return

    def export_dxf(self, obj_name, filename, use_thread=True):
        """
        Exports a Geometry Object to an DXF file.

        :param filename: Path to the DXF file to save to.
        :return:
        """
        if filename is None:
            filename = self.defaults["global_last_save_folder"]

        self.log.debug("export_dxf()")

        format_exc = ''
        units = ''

        try:
            obj = self.collection.get_by_name(str(obj_name))
        except:
            # TODO: The return behavior has not been established... should raise exception?
            return "Could not retrieve object: %s" % obj_name

        # updated units
        units = self.general_options_form.general_app_group.units_radio.get_value().upper()
        if units == 'IN' or units == 'INCH':
            units = 'INCH'
        elif units == 'MM' or units == 'METIRC':
            units ='METRIC'


        def make_dxf():
            try:
                dxf_code = obj.export_dxf()
                dxf_code.saveas(filename)

                self.file_saved.emit("DXF", filename)
                self.inform.emit("[success] DXF file exported to " + filename)
            except:
                return 'fail'

        if use_thread is True:

            with self.proc_container.new("Exporting DXF") as proc:

                def job_thread_exc(app_obj):
                    ret = make_dxf()
                    if ret == 'fail':
                        self.inform.emit('[[warning_notcl]] Could not export DXF file.')
                        return

                self.worker_task.emit({'fcn': job_thread_exc, 'params': [self]})
        else:
            ret = make_dxf()
            if ret == 'fail':
                self.inform.emit('[[warning_notcl]] Could not export DXF file.')
                return

    def import_svg(self, filename, geo_type='geometry', outname=None):
        """
        Adds a new Geometry Object to the projects and populates
        it with shapes extracted from the SVG file.

        :param filename: Path to the SVG file.
        :param outname:
        :return:
        """
        obj_type = ""
        if geo_type is None or geo_type == "geometry":
            obj_type = "geometry"
        elif geo_type == "gerber":
            obj_type = geo_type
        else:
            self.inform.emit("[error_notcl] Not supported type was choosed as parameter. "
                             "Only Geometry and Gerber are supported")
            return

        units = self.general_options_form.general_app_group.units_radio.get_value().upper()

        def obj_init(geo_obj, app_obj):
            geo_obj.import_svg(filename, obj_type, units=units)
            geo_obj.multigeo = False

        with self.proc_container.new("Importing SVG") as proc:

            # Object name
            name = outname or filename.split('/')[-1].split('\\')[-1]

            self.new_object(obj_type, name, obj_init, autoselected=False)
            self.progress.emit(20)
            # Register recent file
            self.file_opened.emit("svg", filename)

            # GUI feedback
            self.inform.emit("[success] Opened: " + filename)
            self.progress.emit(100)

    def import_dxf(self, filename, geo_type='geometry', outname=None):
        """
        Adds a new Geometry Object to the projects and populates
        it with shapes extracted from the DXF file.

        :param filename: Path to the DXF file.
        :param outname:
        :type putname: str
        :return:
        """

        obj_type = ""
        if geo_type is None or geo_type == "geometry":
            obj_type = "geometry"
        elif geo_type == "gerber":
            obj_type = geo_type
        else:
            self.inform.emit("[error_notcl] Not supported type was choosed as parameter. "
                             "Only Geometry and Gerber are supported")
            return

        units = self.general_options_form.general_app_group.units_radio.get_value().upper()

        def obj_init(geo_obj, app_obj):
            geo_obj.import_dxf(filename, obj_type, units=units)
            geo_obj.multigeo = False

        with self.proc_container.new("Importing DXF") as proc:

            # Object name
            name = outname or filename.split('/')[-1].split('\\')[-1]

            self.new_object(obj_type, name, obj_init, autoselected=False)
            self.progress.emit(20)
            # Register recent file
            self.file_opened.emit("dxf", filename)

            # GUI feedback
            self.inform.emit("[success] Opened: " + filename)
            self.progress.emit(100)

    def import_image(self, filename, type='gerber', dpi=96, mode='black', mask=[250, 250, 250, 250], outname=None):
        """
        Adds a new Geometry Object to the projects and populates
        it with shapes extracted from the SVG file.

        :param filename: Path to the SVG file.
        :param outname:
        :return:
        """
        obj_type = ""
        if type is None or type == "geometry":
            obj_type = "geometry"
        elif type == "gerber":
            obj_type = type
        else:
            self.inform.emit("[error_notcl] Not supported type was picked as parameter. "
                             "Only Geometry and Gerber are supported")
            return

        def obj_init(geo_obj, app_obj):
            geo_obj.import_image(filename, units=units, dpi=dpi, mode=mode, mask=mask)
            geo_obj.multigeo = False

        with self.proc_container.new("Importing Image") as proc:

            # Object name
            name = outname or filename.split('/')[-1].split('\\')[-1]
            units = self.general_options_form.general_app_group.units_radio.get_value()

            self.new_object(obj_type, name, obj_init)
            self.progress.emit(20)
            # Register recent file
            self.file_opened.emit("image", filename)

            # GUI feedback
            self.inform.emit("[success] Opened: " + filename)
            self.progress.emit(100)

    def open_gerber(self, filename, follow=False, outname=None):
        """
        Opens a Gerber file, parses it and creates a new object for
        it in the program. Thread-safe.

        :param outname: Name of the resulting object. None causes the
            name to be that of the file.
        :param filename: Gerber file filename
        :type filename: str
        :param follow: If true, the parser will not create polygons, just lines
            following the gerber path.
        :type follow: bool
        :return: None
        """

        # How the object should be initialized
        def obj_init(gerber_obj, app_obj):

            assert isinstance(gerber_obj, FlatCAMGerber), \
                "Expected to initialize a FlatCAMGerber but got %s" % type(gerber_obj)

            # Opening the file happens here
            self.progress.emit(30)
            try:
                gerber_obj.parse_file(filename, follow=follow)
            except IOError:
                app_obj.inform.emit("[error_notcl] Failed to open file: " + filename)
                app_obj.progress.emit(0)
                self.inform.emit('[error_notcl] Failed to open file: ' + filename)
                return "fail"
            except ParseError as err:
                app_obj.inform.emit("[error_notcl] Failed to parse file: " + filename + ". " + str(err))
                app_obj.progress.emit(0)
                self.log.error(str(err))
                return "fail"

            except:
                msg = "[error] An internal error has ocurred. See shell.\n"
                msg += traceback.format_exc()
                app_obj.inform.emit(msg)
                return "fail"

            if gerber_obj.is_empty():
                # app_obj.inform.emit("[error] No geometry found in file: " + filename)
                # self.collection.set_active(gerber_obj.options["name"])
                # self.collection.delete_active()
                self.inform.emit("[error_notcl] Object is not Gerber file or empty. Aborting object creation.")
                return "fail"

            # Further parsing
            self.progress.emit(70)  # TODO: Note the mixture of self and app_obj used here

        if follow is False:
            App.log.debug("open_gerber()")
        else:
            App.log.debug("open_gerber() with 'follow' attribute")

        with self.proc_container.new("Opening Gerber") as proc:

            self.progress.emit(10)

            # Object name
            name = outname or filename.split('/')[-1].split('\\')[-1]

            ### Object creation ###
            ret = self.new_object("gerber", name, obj_init, autoselected=False)
            if ret == 'fail':
                self.inform.emit('[error_notcl] Open Gerber failed. Probable not a Gerber file.')
                return

            # Register recent file
            self.file_opened.emit("gerber", filename)

            self.progress.emit(100)

            # GUI feedback
            self.inform.emit("[success] Opened: " + filename)


    def open_excellon(self, filename, outname=None):
        """
        Opens an Excellon file, parses it and creates a new object for
        it in the program. Thread-safe.

        :param outname: Name of the resulting object. None causes the
            name to be that of the file.
        :param filename: Excellon file filename
        :type filename: str
        :return: None
        """

        App.log.debug("open_excellon()")

        #self.progress.emit(10)

        # How the object should be initialized
        def obj_init(excellon_obj, app_obj):
            # self.progress.emit(20)

            try:
                ret = excellon_obj.parse_file(filename)
                if ret == "fail":
                    log.debug("Excellon parsing failed.")
                    self.inform.emit("[error_notcl] This is not Excellon file.")
                    return "fail"
            except IOError:
                app_obj.inform.emit("[error_notcl] Cannot open file: " + filename)
                log.debug("Could not open Excellon object.")
                self.progress.emit(0)  # TODO: self and app_bjj mixed
                return "fail"
            except:
                msg = "[error_notcl] An internal error has occurred. See shell.\n"
                msg += traceback.format_exc()
                app_obj.inform.emit(msg)
                return "fail"

            ret = excellon_obj.create_geometry()
            if ret == 'fail':
                log.debug("Could not create geometry for Excellon object.")
                return "fail"

            if excellon_obj.is_empty():
                app_obj.inform.emit("[error_notcl] No geometry found in file: " + filename)
                return "fail"

        with self.proc_container.new("Opening Excellon."):

            # Object name
            name = outname or filename.split('/')[-1].split('\\')[-1]

            ret = self.new_object("excellon", name, obj_init, autoselected=False)
            if ret == 'fail':
                self.inform.emit('[error_notcl] Open Excellon file failed. Probable not an Excellon file.')
                return

                # Register recent file
            self.file_opened.emit("excellon", filename)

            # GUI feedback
            self.inform.emit("[success] Opened: " + filename)
            # self.progress.emit(100)

    def open_gcode(self, filename, outname=None):
        """
        Opens a G-gcode file, parses it and creates a new object for
        it in the program. Thread-safe.

        :param outname: Name of the resulting object. None causes the
            name to be that of the file.
        :param filename: G-code file filename
        :type filename: str
        :return: None
        """
        App.log.debug("open_gcode()")

        # How the object should be initialized
        def obj_init(job_obj, app_obj_):
            """

            :type app_obj_: App
            """
            assert isinstance(app_obj_, App), \
                "Initializer expected App, got %s" % type(app_obj_)

            self.progress.emit(10)

            try:
                f = open(filename)
                gcode = f.read()
                f.close()
            except IOError:
                app_obj_.inform.emit("[error_notcl] Failed to open " + filename)
                self.progress.emit(0)
                return "fail"

            job_obj.gcode = gcode

            self.progress.emit(20)

            ret = job_obj.gcode_parse()
            if ret == "fail":
                self.inform.emit("[error_notcl] This is not GCODE")
                return "fail"

            self.progress.emit(60)
            job_obj.create_geometry()

        with self.proc_container.new("Opening G-Code."):

            # Object name
            name = outname or filename.split('/')[-1].split('\\')[-1]

            # New object creation and file processing
            ret = self.new_object("cncjob", name, obj_init, autoselected=False)
            if ret == 'fail':
                self.inform.emit("[error_notcl] Failed to create CNCJob Object. Probable not a GCode file.\n "
                                 "Attempting to create a FlatCAM CNCJob Object from "
                                 "G-Code file failed during processing")
                return "fail"

            # Register recent file
            self.file_opened.emit("cncjob", filename)

            # GUI feedback
            self.inform.emit("[success] Opened: " + filename)
            self.progress.emit(100)

    def open_project(self, filename, run_from_arg=None):
        """
        Loads a project from the specified file.

        1) Loads and parses file
        2) Registers the file as recently opened.
        3) Calls on_file_new()
        4) Updates options
        5) Calls new_object() with the object's from_dict() as init method.
        6) Calls plot_all()

        :param filename:  Name of the file from which to load.
        :type filename: str
        :return: None
        """
        App.log.debug("Opening project: " + filename)

        # Open and parse
        try:
            f = open(filename, 'r')
        except IOError:
            App.log.error("Failed to open project file: %s" % filename)
            self.inform.emit("[error_notcl] Failed to open project file: %s" % filename)
            return

        try:
            d = json.load(f, object_hook=dict2obj)
        except:
            App.log.error("Failed to parse project file: %s" % filename)
            self.inform.emit("[error_notcl] Failed to parse project file: %s" % filename)
            f.close()
            return

        self.file_opened.emit("project", filename)

        # Clear the current project
        ## NOT THREAD SAFE ##
        if run_from_arg is True:
            pass
        else:
            self.on_file_new()

        #Project options
        self.options.update(d['options'])
        self.project_filename = filename
        # self.ui.units_label.setText("[" + self.options["units"] + "]")
        self.set_screen_units(self.options["units"])

        # Re create objects
        App.log.debug("Re-creating objects...")
        for obj in d['objs']:
            def obj_init(obj_inst, app_inst):
                obj_inst.from_dict(obj)
            App.log.debug(obj['kind'] + ":  " + obj['options']['name'])
            self.new_object(obj['kind'], obj['options']['name'], obj_init, active=False, fit=False, plot=True)

        # self.plot_all()
        self.inform.emit("[success] Project loaded from: " + filename)
        App.log.debug("Project loaded")

    def propagate_defaults(self, silent=False):
        """
        This method is used to set default values in classes. It's
        an alternative to project options but allows the use
        of values invisible to the user.

        :return: None
        """

        if silent is False:
            self.log.debug("propagate_defaults()")

        # Which objects to update the given parameters.
        routes = {
            "global_zdownrate": CNCjob,
            "excellon_zeros": Excellon,
            "excellon_format_upper_in": Excellon,
            "excellon_format_lower_in": Excellon,
            "excellon_format_upper_mm": Excellon,
            "excellon_format_lower_mm": Excellon,
            "excellon_units": Excellon,
            "gerber_use_buffer_for_union": Gerber,
            "geometry_multidepth": Geometry
        }

        for param in routes:
            if param in routes[param].defaults:
                try:
                    routes[param].defaults[param] = self.defaults[param]
                    if silent is False:
                        self.log.debug("  " + param + " OK")
                except KeyError:
                    if silent is False:
                        self.log.debug("  ERROR: " + param + " not in defaults.")
            else:
                # Try extracting the name:
                # classname_param here is param in the object
                if param.find(routes[param].__name__.lower() + "_") == 0:
                    p = param[len(routes[param].__name__) + 1:]
                    if p in routes[param].defaults:
                        routes[param].defaults[p] = self.defaults[param]
                        if silent is False:
                            self.log.debug("  " + param + " OK!")

    def restore_main_win_geom(self):
        try:
            self.ui.setGeometry(self.defaults["global_def_win_x"],
                                self.defaults["global_def_win_y"],
                                self.defaults["global_def_win_w"],
                                self.defaults["global_def_win_h"])
            self.ui.splitter.setSizes([self.defaults["def_notebook_width"], 0])
        except KeyError:
            pass

    def plot_all(self):
        """
        Re-generates all plots from all objects.

        :return: None
        """
        self.log.debug("Plot_all()")

        for obj in self.collection.get_list():
            def worker_task(obj):
                with self.proc_container.new("Plotting"):
                    obj.plot()
                    self.object_plotted.emit(obj)

            # Send to worker
            self.worker_task.emit({'fcn': worker_task, 'params': [obj]})


        # self.progress.emit(10)
        #
        # def worker_task(app_obj):
        #     print "worker task"
        #     percentage = 0.1
        #     try:
        #         delta = 0.9 / len(self.collection.get_list())
        #     except ZeroDivisionError:
        #         self.progress.emit(0)
        #         return
        #     for obj in self.collection.get_list():
        #         with self.proc_container.new("Plotting"):
        #             obj.plot()
        #             app_obj.object_plotted.emit(obj)
        #
        #         percentage += delta
        #         self.progress.emit(int(percentage*100))
        #
        #     self.progress.emit(0)
        #     self.plots_updated.emit()
        #
        # # Send to worker
        # #self.worker.add_task(worker_task, [self])
        # self.worker_task.emit({'fcn': worker_task, 'params': [self]})

    def register_folder(self, filename):
        self.defaults["global_last_folder"] = os.path.split(str(filename))[0]

    def register_save_folder(self, filename):
        self.defaults['global_last_save_folder'] = os.path.split(str(filename))[0]

    def set_progress_bar(self, percentage, text=""):
        self.ui.progress_bar.setValue(int(percentage))

    def setup_shell(self):
        """
        Creates shell functions. Runs once at startup.

        :return: None
        """

        self.log.debug("setup_shell()")

        def shelp(p=None):
            if not p:
                return "Available commands:\n" + \
                       '\n'.join(['  ' + cmd for cmd in sorted(commands)]) + \
                       "\n\nType help <command_name> for usage.\n Example: help open_gerber"

            if p not in commands:
                return "Unknown command: %s" % p

            return commands[p]["help"]

        # --- Migrated to new architecture ---
        # def options(name):
        #     ops = self.collection.get_by_name(str(name)).options
        #     return '\n'.join(["%s: %s" % (o, ops[o]) for o in ops])

        def h(*args):
            """
            Pre-processes arguments to detect '-keyword value' pairs into dictionary
            and standalone parameters into list.
            """

            kwa = {}
            a = []
            n = len(args)
            name = None
            for i in range(n):
                match = re.search(r'^-([a-zA-Z].*)', args[i])
                if match:
                    assert name is None
                    name = match.group(1)
                    continue

                if name is None:
                    a.append(args[i])
                else:
                    kwa[name] = args[i]
                    name = None

            return a, kwa

        @contextmanager
        def wait_signal(signal, timeout=10000):
            """
            Block loop until signal emitted, timeout (ms) elapses
            or unhandled exception happens in a thread.

            :param signal: Signal to wait for.
            """
            loop = QtCore.QEventLoop()

            # Normal termination
            signal.connect(loop.quit)

            # Termination by exception in thread
            self.thread_exception.connect(loop.quit)

            status = {'timed_out': False}

            def report_quit():
                status['timed_out'] = True
                loop.quit()

            yield

            # Temporarily change how exceptions are managed.
            oeh = sys.excepthook
            ex = []

            def except_hook(type_, value, traceback_):
                ex.append(value)
                oeh(type_, value, traceback_)
            sys.excepthook = except_hook

            # Terminate on timeout
            if timeout is not None:
                QtCore.QTimer.singleShot(timeout, report_quit)

            #### Block ####
            loop.exec_()

            # Restore exception management
            sys.excepthook = oeh
            if ex:
                self.raiseTclError(str(ex[0]))

            if status['timed_out']:
                raise Exception('Timed out!')

        def make_docs():
            output = ''
            import collections
            od = collections.OrderedDict(sorted(commands.items()))
            for cmd_, val in od.items():
                output += cmd_ + ' \n' + ''.join(['~'] * len(cmd_)) + '\n'

                t = val['help']
                usage_i = t.find('>')
                if usage_i < 0:
                    expl = t
                    output += expl + '\n\n'
                    continue

                expl = t[:usage_i - 1]
                output += expl + '\n\n'

                end_usage_i = t[usage_i:].find('\n')

                if end_usage_i < 0:
                    end_usage_i = len(t[usage_i:])
                    output += '    ' + t[usage_i:] + '\n       No parameters.\n'
                else:
                    extras = t[usage_i+end_usage_i+1:]
                    parts = [s.strip() for s in extras.split('\n')]

                    output += '    ' + t[usage_i:usage_i+end_usage_i] + '\n'
                    for p in parts:
                        output += '       ' + p + '\n\n'

            return output

        '''
            Howto implement TCL shell commands:

            All parameters passed to command should be possible to set as None and test it afterwards.
            This is because we need to see error caused in tcl,
            if None value as default parameter is not allowed TCL will return empty error.
            Use:
                def mycommand(name=None,...):

            Test it like this:
            if name is None:

                self.raise_tcl_error('Argument name is missing.')

            When error ocurre, always use raise_tcl_error, never return "sometext" on error,
            otherwise we will miss it and processing will silently continue.
            Method raise_tcl_error  pass error into TCL interpreter, then raise python exception,
            which is catched in exec_command and displayed in TCL shell console with red background.
            Error in console is displayed  with TCL  trace.

            This behavior works only within main thread,
            errors with promissed tasks can be catched and detected only with log.
            TODO: this problem have to be addressed somehow, maybe rewrite promissing to be blocking somehow for TCL shell.

            Kamil's comment: I will rewrite existing TCL commands from time to time to follow this rules.

        '''

        commands = {
            'help': {
                'fcn': shelp,
                'help': "Shows list of commands."
            },
        }

        # Import/overwrite tcl commands as objects of TclCommand descendants
        # This modifies the variable 'commands'.
        tclCommands.register_all_commands(self, commands)

        # Add commands to the tcl interpreter
        for cmd in commands:
            self.tcl.createcommand(cmd, commands[cmd]['fcn'])

        # Make the tcl puts function return instead of print to stdout
        self.tcl.eval('''
            rename puts original_puts
            proc puts {args} {
                if {[llength $args] == 1} {
                    return "[lindex $args 0]"
                } else {
                    eval original_puts $args
                }
            }
            ''')

    def setup_recent_items(self):

        # TODO: Move this to constructor
        icons = {
            "gerber": "share/flatcam_icon16.png",
            "excellon": "share/drill16.png",
            "cncjob": "share/cnc16.png",
            "project": "share/project16.png",
            "svg": "share/geometry16.png",
            "dxf": "share/dxf16.png",
            "image": "share/image16.png"

        }

        openers = {
            'gerber': lambda fname: self.worker_task.emit({'fcn': self.open_gerber, 'params': [fname]}),
            'excellon': lambda fname: self.worker_task.emit({'fcn': self.open_excellon, 'params': [fname]}),
            'cncjob': lambda fname: self.worker_task.emit({'fcn': self.open_gcode, 'params': [fname]}),
            'project': self.open_project,
            'svg': self.import_svg,
            'dxf': self.import_dxf,
            'image': self.import_image
        }

        # Open file
        try:
            f = open(self.data_path + '/recent.json')
        except IOError:
            App.log.error("Failed to load recent item list.")
            self.inform.emit("[error_notcl] Failed to load recent item list.")
            return

        try:
            self.recent = json.load(f)
        except json.scanner.JSONDecodeError:
            App.log.error("Failed to parse recent item list.")
            self.inform.emit("[error_notcl] Failed to parse recent item list.")
            f.close()
            return
        f.close()

        # Closure needed to create callbacks in a loop.
        # Otherwise late binding occurs.
        def make_callback(func, fname):
            def opener():
                func(fname)
            return opener

        def reset_recent():
            # Reset menu
            self.ui.recent.clear()
            self.recent = []
            try:
                f = open(self.data_path + '/recent.json', 'w')
            except IOError:
                App.log.error("Failed to open recent items file for writing.")
                return

            json.dump(self.recent, f)

        # Reset menu
        self.ui.recent.clear()

        # Create menu items
        for recent in self.recent:
            filename = recent['filename'].split('/')[-1].split('\\')[-1]

            try:
                action = QtWidgets.QAction(QtGui.QIcon(icons[recent["kind"]]), filename, self)

                # Attach callback
                o = make_callback(openers[recent["kind"]], recent['filename'])
                action.triggered.connect(o)

                self.ui.recent.addAction(action)

            except KeyError:
                App.log.error("Unsupported file type: %s" % recent["kind"])

        # Last action in Recent Files menu is one that Clear the content
        clear_action = QtWidgets.QAction(QtGui.QIcon('share/trash32.png'), "Clear Recent files", self)
        clear_action.triggered.connect(reset_recent)
        self.ui.recent.addSeparator()
        self.ui.recent.addAction(clear_action)

        # self.builder.get_object('open_recent').set_submenu(recent_menu)
        # self.ui.menufilerecent.set_submenu(recent_menu)
        # recent_menu.show_all()
        # self.ui.recent.show()

        self.log.debug("Recent items list has been populated.")

    def setup_component_editor(self):
        label = QtWidgets.QLabel("Choose an item from Project")
        label.setAlignment(QtCore.Qt.AlignHCenter | QtCore.Qt.AlignVCenter)
        self.ui.selected_scroll_area.setWidget(label)

    def setup_obj_classes(self):
        """
        Sets up application specifics on the FlatCAMObj class.

        :return: None
        """
        FlatCAMObj.app = self
        ObjectCollection.app = self

        FCProcess.app = self
        FCProcessContainer.app = self

    def version_check(self):
        """
        Checks for the latest version of the program. Alerts the
        user if theirs is outdated. This method is meant to be run
        in a separate thread.

        :return: None
        """

        self.log.debug("version_check()")

        if self.general_defaults_form.general_gui_group.send_stats_cb.get_value() is True:
            full_url = App.version_url + \
                       "?s=" + str(self.defaults['global_serial']) + \
                       "&v=" + str(self.version) + \
                       "&os=" + str(self.os) + \
                       "&" + urllib.parse.urlencode(self.defaults["global_stats"])
        else:
            # no_stats dict; just so it won't break things on website
            no_ststs_dict = {}
            no_ststs_dict["global_ststs"] = {}
            full_url = App.version_url + \
                       "?s=" + str(self.defaults['global_serial']) + \
                       "&v=" + str(self.version) + \
                       "&os=" + str(self.os) + \
                       "&" + urllib.parse.urlencode(no_ststs_dict["global_ststs"])

        App.log.debug("Checking for updates @ %s" % full_url)
        ### Get the data
        try:
            f = urllib.request.urlopen(full_url)
        except:
            # App.log.warning("Failed checking for latest version. Could not connect.")
            self.log.warning("Failed checking for latest version. Could not connect.")
            self.inform.emit("[warning_notcl] Failed checking for latest version. Could not connect.")
            return

        try:
            data = json.load(f)
        except Exception as e:
            App.log.error("Could not parse information about latest version.")
            self.inform.emit("[error_notcl] Could not parse information about latest version.")
            App.log.debug("json.load(): %s" % str(e))
            f.close()
            return

        f.close()

        ### Latest version?
        if self.version >= data["version"]:
            App.log.debug("FlatCAM is up to date!")
            self.inform.emit("[success] FlatCAM is up to date!")
            return

        App.log.debug("Newer version available.")
        self.message.emit(
            "Newer Version Available",
            str("There is a newer version of FlatCAM " +
                           "available for download:<br><br>" +
                           "<B>" + data["name"] + "</b><br>" +
                           data["message"].replace("\n", "<br>")),
            "info"
        )

    # TODO: FIX THIS
    '''
    By default this is not threaded
    If threaded the app give warnings like this:
    
    QObject::connect: Cannot queue arguments of type 'QVector<int>' 
    (Make sure 'QVector<int>' is registered using qRegisterMetaType().
    '''
    def enable_plots(self, objects, threaded=False):
        if threaded is True:
            def worker_task(app_obj):
                percentage = 0.1
                try:
                    delta = 0.9 / len(objects)
                except ZeroDivisionError:
                    self.progress.emit(0)
                    return
                for obj in objects:
                    obj.options['plot'] = True
                    percentage += delta
                    self.progress.emit(int(percentage*100))

                self.progress.emit(0)
                self.plots_updated.emit()
                self.collection.update_view()

            # Send to worker
            # self.worker.add_task(worker_task, [self])
            self.worker_task.emit({'fcn': worker_task, 'params': [self]})
        else:
            for obj in objects:
                obj.options['plot'] = True
            self.progress.emit(0)
            self.plots_updated.emit()
            self.collection.update_view()

    # TODO: FIX THIS
    '''
    By default this is not threaded
    If threaded the app give warnings like this:

    QObject::connect: Cannot queue arguments of type 'QVector<int>' 
    (Make sure 'QVector<int>' is registered using qRegisterMetaType().
    '''
    def disable_plots(self, objects, threaded=False):
        # TODO: This method is very similar to replot_all. Try to merge.
        """
        Disables plots
        :param objects: list
            Objects to be disabled
        :return:
        """

        if threaded is True:
            self.progress.emit(10)
            def worker_task(app_obj):
                percentage = 0.1
                try:
                    delta = 0.9 / len(objects)
                except ZeroDivisionError:
                    self.progress.emit(0)
                    return

                for obj in objects:
                    obj.options['plot'] = False
                    percentage += delta
                    self.progress.emit(int(percentage*100))

                self.progress.emit(0)
                self.plots_updated.emit()
                self.collection.update_view()

            # Send to worker
            self.worker_task.emit({'fcn': worker_task, 'params': [self]})
        else:
            for obj in objects:
                obj.options['plot'] = False
            self.plots_updated.emit()
            self.collection.update_view()

    def clear_plots(self):

        objects = self.collection.get_list()

        for obj in objects:
            obj.clear(obj == objects[-1])

        # Clear pool to free memory
        self.clear_pool()

    def generate_cnc_job(self, objects):
        for obj in objects:
            obj.generatecncjob()

    def save_project(self, filename):
        """
        Saves the current project to the specified file.

        :param filename: Name of the file in which to save.
        :type filename: str
        :return: None
        """
        self.log.debug("save_project()")

        with self.proc_container.new("Saving FlatCAM Project") as proc:
            ## Capture the latest changes
            # Current object
            try:
                self.collection.get_active().read_form()
            except:
                self.log.debug("[warning] There was no active object")
                pass
            # Project options
            self.options_read_form()

            # Serialize the whole project
            d = {"objs": [obj.to_dict() for obj in self.collection.get_list()],
                 "options": self.options,
                 "version": self.version}

            # Open file
            try:
                f = open(filename, 'w')
            except IOError:
                App.log.error("[error] Failed to open file for saving: %s", filename)
                return

            # Write
            json.dump(d, f, default=to_dict, indent=2, sort_keys=True)
            f.close()

        # verification of the saved project
            # Open and parse
            try:
                saved_f = open(filename, 'r')
            except IOError:
                self.inform.emit("[error_notcl] Failed to verify project file: %s. Retry to save it." % filename)
                return

            try:
                saved_d = json.load(saved_f, object_hook=dict2obj)
            except:
                self.inform.emit("[error_notcl] Failed to parse saved project file: %s. Retry to save it." % filename)
                f.close()
                return
            saved_f.close()

            if 'version' in saved_d:
                self.inform.emit("[success] Project saved to: %s" % filename)
            else:
                self.inform.emit("[error_notcl] Failed to save project file: %s. Retry to save it." % filename)

    def on_options_app2project(self):
        """
        Callback for Options->Transfer Options->App=>Project. Copies options
        from application defaults to project defaults.

        :return: None
        """

        self.report_usage("on_options_app2project")

        self.defaults_read_form()
        self.options.update(self.defaults)
        self.options_write_form()

    def on_options_project2app(self):
        """
        Callback for Options->Transfer Options->Project=>App. Copies options
        from project defaults to application defaults.

        :return: None
        """

        self.report_usage("on_options_project2app")

        self.options_read_form()
        self.defaults.update(self.options)
        self.defaults_write_form()

    def on_options_project2object(self):
        """
        Callback for Options->Transfer Options->Project=>Object. Copies options
        from project defaults to the currently selected object.

        :return: None
        """

        self.report_usage("on_options_project2object")

        self.options_read_form()
        obj = self.collection.get_active()
        if obj is None:
            self.inform.emit("WARNING: No object selected.")
            return
        for option in self.options:
            if option.find(obj.kind + "_") == 0:
                oname = option[len(obj.kind) + 1:]
                obj.options[oname] = self.options[option]
        obj.to_form()  # Update UI

    def on_options_object2project(self):
        """
        Callback for Options->Transfer Options->Object=>Project. Copies options
        from the currently selected object to project defaults.

        :return: None
        """

        self.report_usage("on_options_object2project")

        obj = self.collection.get_active()
        if obj is None:
            self.inform.emit("WARNING: No object selected.")
            return
        obj.read_form()
        for option in obj.options:
            if option in ['name']:  # TODO: Handle this better...
                continue
            self.options[obj.kind + "_" + option] = obj.options[option]
        self.options_write_form()

    def on_options_object2app(self):
        """
        Callback for Options->Transfer Options->Object=>App. Copies options
        from the currently selected object to application defaults.

        :return: None
        """

        self.report_usage("on_options_object2app")

        obj = self.collection.get_active()
        if obj is None:
            self.inform.emit("WARNING: No object selected.")
            return
        obj.read_form()
        for option in obj.options:
            if option in ['name']:  # TODO: Handle this better...
                continue
            self.defaults[obj.kind + "_" + option] = obj.options[option]
        self.defaults_write_form()

    def on_options_app2object(self):
        """
        Callback for Options->Transfer Options->App=>Object. Copies options
        from application defaults to the currently selected object.

        :return: None
        """

        self.report_usage("on_options_app2object")

        self.defaults_read_form()
        obj = self.collection.get_active()
        if obj is None:
            self.inform.emit("WARNING: No object selected.")
            return
        for option in self.defaults:
            if option.find(obj.kind + "_") == 0:
                oname = option[len(obj.kind) + 1:]
                obj.options[oname] = self.defaults[option]
        obj.to_form()  # Update UI

# end of file